ToolUSA Deluxe Jeweler's Set of 12" Ring Mandrel and Double-Face Nylon & Rubber Mallet Mandrel Is 12 Inches Long And Measures Ring Sizes From 1 To 15 Made Of Quality Hardened Steel That Protects It From Damage, Unlike The Inferior Plastic Ones 3 Inch Long Nylon And Rubber Mallet Heads Help To Avoid Scratches When Working With Jeweler/metal Cushioned Non-slip Hammer Grip Allows For Easy Holding Heads Of The Hammers Are 30 Mm Wide