Harley Benton StrapMaster Pack2
Harley Benton StrapMaster Pack2, Security Lock for Guitar and Bass Straps, Suitable for all guitar and bass strap buttons in standard sizing, Can be easily slipped over the strap pin, Locks and seals the strap button onto the pin and holds it securely in its place, No tools or modifications necessary, Material: Natural rubber, Package with 4 pieces - 2x grey & 2x black