JSP Hard Rubber Doming Block: TJ01-09801 This block measures a perfect 4 X 4 Inches square, and 1 inch high Hard rubber composition-tough enough to withstand metal hammers This rubber surfaced block won't mar or scratch your precious metal surfaces This rubber bench block is great for working with jewelery or other small metal items Great when you need to use number and letter punches- weighs 15.4 ounces