Otherwise cheaper black materials such as black enamel or vulcanite were used. In the 1850s, Ash and his company developed Vulcanite (hardened rubber that seated porcelain teeth). The early bodies have a vulcanite body covering, engraved shutter speeds, and strap lugs. This resulted in a growing demand for the Bausch and Lomb spectacles made from vulcanite. Black Vulcanite is an award-winning rap group based in Windhoek, Namibia. The M9-P also replaces the body covering with vulcanite, as used on earlier M cameras.