In Range Supplies sell range and shoot house equipment, including ricochet preventing material made out of recycled rubber. Someone at the company figured out that if you cut the rubber up into a block it makes for a nifty shooting rest. The company is now selling the In Range Sight-Bloc made from recycled rubber. Each block has been cut on three sizes so that it can be rotated to give different in height shooting platform. The MSRP is $50.