The Box One Stealth Expert Hubset is designed to be lightweight for lightweight riders and features small hub flanges, and decreased material to keep the weight down. This makes the Stealth Expert Hubset ideal for any Mini, Junior or Expert wheel build, but may also accommodate a lightweight rider looking to move up to a pro-sized bike. Recommended Rider weight under 140lbs. Chromoly bolts included. ###section### Product Specs AXLE SIZE: 10mm SPOKE HOLES:  BEARINGS: Sealed WEIGHT: 105g (3.7oz without bolts) Colour: Black