Product Information Material: Silicone Select a Product Part NumberSize WS-600-0066" BISO, 6" SISO WS-250-0062", 2½" BISO, 1¼", 1½", 2" SISO WS-300-0063" BISO, 2 1/2", 3" SISO WS-400-0064" BISO, 4" SISO WS-150-0061", 1½" BISO, 1" SISO