Both the brass and stainless steel ball chain options are easy for the customer to adjust down from the standard 27" length. Simply cut the chain with a pair of scissors or wire-cutters. The antique brass ball option already has a dark patina, and the natural brass ball chain is a bright brass color. The antique brass diamond cut chain is a more rugged look, with rectangular links interlocking at right angles. The antique brass curb chain is designed to lay flat against your skin, with interlocking twisted oval links. The stainless steel cable chain is 3.1mm thick and looks more like a "traditional" chain with a more rugged look, with oval links interlocking at right angles. All styles of stainless steel chain are nickel-free. If you are unsure about which chain length to order, please read our suggestions on the FAQ page.