The new S-Locks. S for save, S for silent and S for Schaller strap locks!
Amazon.com: Musiclily Guitar Bass Schaller-Style Security Straplocks Round Head Lock Strap Pins and buttons Straplocks System for Fender Electric Guitar Bass Replacement,Gold (Pack of 2) : Musical Instruments
S-Locks M | S-Locks | Schaller Webshop
Amazon.com: Schaller S Locks Guitar Strap Locks and Buttons (Pair) Chrome : Musical Instruments