4 x 4 x 3/4 inch Jewelers Rubber Bench Block — widgetsupply.com
Rockler Rubber Bench Mat, 2' x 5' - Rockler
Amazon.com: BENCH WIZARD 12" Large Rubber Pad | 12" x 12" x 1/4" | Urethane Absorbs Impact & Protects Work Surface | Essential Tool for Jewelry Making, Metalworking, Crafting
Amazon.com: SE Jeweler's 4" x 4” x 1" Black Solid Rubber Bench Block - JT34442RB : Arts, Crafts & Sewing
Rubber Bench Block, Black 4 in x 4 in (10 cm x 10 cm), Square