The Paragon guard sprocket offers you sleek design and maximum durability combined all in one. MATERIAL: 6061-T6 ALLOY, FULL CNC THICKNESS: 6.5MM (SPROCKET), 10MM (GUARD) SIZE: 25T SPECIAL FEATURES: SUPER TOUGH LOW FRICTION 10MM NYLON/FIBREGLASS GUARD • 5X BOLT INTERFACE FOR INCREASED DURABILITY • 23.8MM BORE HOLE (WITHOUT ADAPTER ADDED) • INCL. 3 ADAPTERS TO FIT 19MM AND 22MM SPINDLES WEIGHT: 157G (5.55OZ) COLORS: BLACK/OILSLICK