The new S-Locks. S for save, S for silent and S for Schaller strap locks!
Schaller S-Locks Pair - Chrome Straplock
Schaller Strap Buttons for S-Locks - StewMac
Schaller Strap Locks 509C - Chrome
S-Locks M | S-Locks | Schaller Webshop
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