-The model "for ARC 006" suits for ARC MT005/MT006/MT007 and Fits for Shimano 8-11 Speeds hubs; "for 010 11S QR" model fits for Shimano 8-11 Speeds 135x10mm quick release and for ARC MT009 adapter; "010 12s Thru Axle" model fits for Shimano 12 Speeds and 142x12mm thru with ARC MT010 adapter -"010 12s QR" model fits for Shimano 12 Speeds and 135x10mm quick release with ARC MT010 adapter; "009 11S QR" model suits for Shimano 12 Speeds and 135x10mm quick release with ARC MT009 adapter; "009 XD QR" model suits for XD XDR 12 Speeds and 135x10mm quick release with ARC MT010 and "010 XD QR" fits for XD XDR 12 Speeds and 135x10mm quick release with ARC010 adapter -the freehub body parts and end made of premium aluminium alloy material, lightweight, sturdy, durable and high strength -Sealed bearings provide high waterproof performance, low resistance force for smooth rotating -Classical 4 or 6 pawls freehub with clear sound, wear resistant and high performance Package Includes: 1 Piece Bike Freehub Body with or without adapter (depends on your choice)