Strap (22mm) fits for T-Rex 3, Balance, Cheetah Pro, Cheetah round, Bip 5, Bip 5 Unity, GTR 4, GTR 3 Pro,  GTR 3, GTR 2, GTR 2e, GTR 47mm.

Strap (20mm) fits for Active, GTR Mini, GTS 4, GTS 4 Mini, GTS 3, GTS 2, GTS 2e, GTS 2 Mini, GTS, GTR 42mm, Bip 3 Pro, Bip 3, Bip U Pro, Bip U