Specifications Model Number:magic button Origin:Mainland China Item:Bicycle Chain Link Type:Chain conector Name:Chain Magic Buckle Feature:Bicycle chain link Model:Chain missing link original MTB Bicycle Chain Link Missing Link 6 7 8 9 10 11 12speed 2 pair for Gold Silver free shipping 9 Speeds magic link: Manufacturer Code: CL566R Chain Width: 6.6mm Reusable Color: Silver Compatible with chain S himano chain and S RAM 9 speed chain 10 Speeds magic link: Manufacturer Code: CL559R Chain Width: 5.88mm Reusable Color: Silver or Gold Compatible with chain chain and 10 speed chain 11 Speeds magic link: Manufacturer Code: CL555 Chain Width: 5.65mm Non-Reusable Color: Silver or Gold Compatible with chain chain and 11 speed chain 12 Speed magic link: Manufacturer Code: CL552 Chain Width: 5.2mm Non-Reusable Color: Silver or Gold Compatible with chain chain and 12 speed chain One bo x contains 2 pairs of magic chains.