Box Three Pro BMX V-Brake Caliper - Long Reach (108mm) - Blue Disc Brake These are steel heat-treated crank

These are steel heat-treated crank bolts for 19mm GHD Profile crank spindles

This is a 3/8" Hollow Chromoly inner replacement axle exclusively for Profile Z Coaster® hubs

The SE Big Honkin' Cruiser Bars are constructed of 4130 chromoly

It requires a 19mm bottom bracket (not included)

Box Three Pro BMX V-Brake Caliper - Long Reach (108mm) - Blue Disc Brake These are steel heat-treated crankThe Box Three brake arms are cold forged from 6061 T6 aluminum. Cold forging produces the strongest, lightest weight and most durable bicycle parts. 35mm of vertical brake pad adjustment Includes new, proprietary, two tone, dual compound, Box Three Air Flow, one piece brake shoes Arm length: 108mm Color: Blue