Each opener is made from a used bicycle gear and chain. Sizes and coloring vary slightly, depending on the first life of the materials as bicycle parts. However, all bottle openers are free of grease and polished with a steel brush to bring out a subtle luster. Specifications: Exterior chain is secured loose, and shakes in place a little. Interior chain links have been hammered to make them rigid. Branded with a leather embossed tag attached with inner tube cord. Each bottle opener is unique, and pieced together by hand. Approximately 2.5" in diameter, and .5" thick. Handmade in DC