These new revolutionary Schaller S-Locks are silent for noiseless performance while moving and playing your instruments. They feature an elegant Lock-Wheel, one-piece hardened steel strap buttons, aesthetic design, perfect handling and all former hiccups have been tackled! All S-Locks come in a new and attractive re-usable crystal box. In 1981, Schaller developed and got the patent for a totally new category of product, which revolutionized the connection between guitar and strap. With its unique design and functionality, Schaller has been setting the standard in strap locks for decades.