The Bomber Z1 Coil fork shares the same 36mm chassis and GRIP damper as the modern-day Bomber Z1, but combined with the most advanced coil spring system Marzocchi has ever made.Ultra-lightweight tempered silicon-chromium steel spring (Medium Spring included) Noise management system for near silent performanceIntegrated air assist for progressivity and bottom out controlExternal preload adjuster to dial in sag and firmness off the top Travel can easily be changed in 10mm increments from 150-180mm (depending on wheel size) via included reconfigurable internal spacersAdditional springs sold separately to fine-tune and adjust for rider preference