The new S-Locks. S for save, S for silent and S for Schaller strap locks!
Allparts Schaller Style Guitar Security Strap Locks In Nickel (Old Sty – Megatone Music
Amazon.com: Schaller S Locks Guitar Strap Locks and Buttons (Pair) Chrome : Musical Instruments
Amazon.com: Musiclily Flat Head Guitar Big Strap Locks System Schaller-Style Straplocks Parts for Electric Acoustic Guitar Bass,Gold(Pack of 2) : Musical Instruments
Schaller S Locks Guitar Strap Locks Chrome
Real Life Relics Fender® Aged Schaller Designed Strap Locks (Fender® SKU 0990690000) - Tricked Out Guitar
AP-0681-010 Schaller Chrome Strap Locks - Danny D's Guitar Hacienda