diff --git a/SabreTools.Models/GZIP/Archive.cs b/SabreTools.Models/GZIP/Archive.cs
index 29b4c6a..3aea052 100644
--- a/SabreTools.Models/GZIP/Archive.cs
+++ b/SabreTools.Models/GZIP/Archive.cs
@@ -6,13 +6,13 @@ namespace SabreTools.Models.GZIP
         /// <summary>
         /// Header including optional fields
         /// </summary>
-        public Header? Header;
+        public Header? Header { get; set; }
 
         // Compressed blocks live here
 
         /// <summary>
         /// Trailer
         /// </summary>
-        public Trailer? Trailer;
+        public Trailer? Trailer { get; set; }
     }
 }
\ No newline at end of file
diff --git a/SabreTools.Models/GZIP/ExtraFieldData.cs b/SabreTools.Models/GZIP/ExtraFieldData.cs
index 779ce35..d310e3a 100644
--- a/SabreTools.Models/GZIP/ExtraFieldData.cs
+++ b/SabreTools.Models/GZIP/ExtraFieldData.cs
@@ -7,20 +7,20 @@ namespace SabreTools.Models.GZIP
         /// SI1 and SI2 provide a subfield ID, typically two ASCII letters
         /// with some mnemonic value.
         /// </summary>
-        public byte SI1;
+        public byte SI1 { get; set; }
 
         /// <summary>
         /// SI1 and SI2 provide a subfield ID, typically two ASCII letters
         /// with some mnemonic value.
         /// </summary>
-        public byte SI2;
+        public byte SI2 { get; set; }
 
         /// <summary>
         /// LEN gives the length of the subfield data, excluding the 4
         /// initial bytes.
         /// </summary>
-        public ushort LEN;
+        public ushort Length { get; set; }
 
-        public byte[]? Data;
+        public byte[]? Data { get; set; }
     }
 }
\ No newline at end of file
diff --git a/SabreTools.Models/GZIP/Header.cs b/SabreTools.Models/GZIP/Header.cs
index f09e3b4..a17a1fc 100644
--- a/SabreTools.Models/GZIP/Header.cs
+++ b/SabreTools.Models/GZIP/Header.cs
@@ -6,22 +6,22 @@ namespace SabreTools.Models.GZIP
         /// <summary>
         /// IDentification 1 (0x1F)
         /// </summary>
-        public byte ID1;
+        public byte ID1 { get; set; }
 
         /// <summary>
         /// IDentification 2 (0x8B)
         /// </summary>
-        public byte ID2;
+        public byte ID2 { get; set; }
 
         /// <summary>
         /// Compression Method
         /// </summary>
-        public CompressionMethod CM;
+        public CompressionMethod CompressionMethod { get; set; }
 
         /// <summary>
         /// FLaGs
         /// </summary>
-        public Flags FLG;
+        public Flags Flags { get; set; }
 
         /// <summary>
         /// Modification TIME
@@ -35,12 +35,12 @@ namespace SabreTools.Models.GZIP
         /// compression started.  MTIME = 0 means no time stamp is
         /// available.
         /// </summary>
-        public uint MTIME;
+        public uint LastModifiedTime { get; set; }
 
         /// <summary>
         /// eXtra FLags
         /// </summary>
-        public ExtraFlags XFL;
+        public ExtraFlags ExtraFlags { get; set; }
 
         /// <summary>
         /// Operating System
@@ -49,7 +49,7 @@ namespace SabreTools.Models.GZIP
         /// took place.  This may be useful in determining end-of-line
         /// convention for text files.
         /// </summary>
-        public OperatingSystem OS;
+        public OperatingSystem OperatingSystem { get; set; }
 
         /// <summary>
         /// eXtra LENgth
@@ -57,7 +57,7 @@ namespace SabreTools.Models.GZIP
         /// If FLG.FEXTRA is set, this gives the length of the optional
         /// extra field.
         /// </summary>
-        public ushort XLEN;
+        public ushort ExtraLength { get; set; }
 
         /// <summary>
         /// Extra field
@@ -66,23 +66,23 @@ namespace SabreTools.Models.GZIP
         /// the header, with total length XLEN bytes.  It consists of a
         /// series of subfields, each of the form <see cref="ExtraFieldData"/>.
         /// </summary>
-        public ExtraFieldData[]? ExtraField;
+        public ExtraFieldData[]? ExtraField { get; set; }
 
         /// <summary>
-        /// Original filename before compression, zero-terminated
+        /// Original filename before compression, null-terminated
         /// </summary>
-        public string? OriginalFileName;
+        public string? OriginalFileName { get; set; }
 
         /// <summary>
-        /// File comment, zero terminated
+        /// File comment, null terminated
         /// </summary>
-        public string? FileComment;
+        public string? FileComment { get; set; }
 
         /// <summary>
         ///  The CRC16 consists of the two least significant bytes of the
         ///  CRC32 for all bytes of the gzip header up to and not including
         ///  the CRC16.
         /// </summary>
-        public ushort? CRC16;
+        public ushort? CRC16 { get; set; }
     }
 }
\ No newline at end of file
diff --git a/SabreTools.Models/GZIP/Trailer.cs b/SabreTools.Models/GZIP/Trailer.cs
index 9a878ef..c0a1ebb 100644
--- a/SabreTools.Models/GZIP/Trailer.cs
+++ b/SabreTools.Models/GZIP/Trailer.cs
@@ -13,7 +13,7 @@ namespace SabreTools.Models.GZIP
         /// ordering ISO documents. See gopher://info.itu.ch for an
         /// online version of ITU-T V.42.)
         /// </summary>
-        public uint CRC32;
+        public uint CRC32 { get; set; }
 
         /// <summary>
         /// Input SIZE
@@ -21,6 +21,6 @@ namespace SabreTools.Models.GZIP
         /// This contains the size of the original (uncompressed) input
         /// data modulo 2^32.
         /// </summary>
-        public uint ISIZE;
+        public uint InputSize { get; set; }
     }
 }
\ No newline at end of file
diff --git a/SabreTools.Models/TAR/Archive.cs b/SabreTools.Models/TAR/Archive.cs
index c167179..4957e50 100644
--- a/SabreTools.Models/TAR/Archive.cs
+++ b/SabreTools.Models/TAR/Archive.cs
@@ -1,5 +1,3 @@
-using System.Collections.Generic;
-
 namespace SabreTools.Models.TAR
 {
     public sealed class Archive
diff --git a/SabreTools.Models/TAR/Block.cs b/SabreTools.Models/TAR/Block.cs
index 0c98ec5..16c7eb1 100644
--- a/SabreTools.Models/TAR/Block.cs
+++ b/SabreTools.Models/TAR/Block.cs
@@ -2,6 +2,10 @@ namespace SabreTools.Models.TAR
 {
     public sealed class Block
     {
-        public byte[]? Data = new byte[512];
+        /// <summary>
+        /// Data
+        /// </summary>
+        /// <remarks>512 bytes</remarks>
+        public byte[]? Data { get; set; }
     }
 }
\ No newline at end of file