Specifications: Top Mounting: AL6061-T6, black, full CNC precision machining Low-speed Compression Adjuster: AL6061-T6, red, full CNC precision machining High-speed Compression Adjuster: AL6061-T6, gold, full CNC precision machining Air Chamber: AL6061-T6, champagne gold, precision-drawn tube Lower Fork: AL6061-T6, black, full CNC machining Lock Nut: AL6061-T6, black, full CNC precision machining Oil Chamber: AL7075-T6, hard anodized, precision machining (honing) Spring Guide Bushing: POM, black, oil cylinder protection Piston Rod: 40Cr, hard chrome plated, can be polished then re-chromed Main Spring: 55CrSi-C-G8, black, high-performance spring Features: 30mm large cylinder bore diameter, makes damping more tunable Added high-pressure adjustment function, wider compression tuning range Professionally calculated internal oil channels, maximizes shock absorber performance Uses imported high-performance shock oil, stable damping & low temperature fade Professionally tuned damping by domestic and international experts (extensively tested), award-winning performance Fitment: For Surron Light Bee 2019-2025 Package Included: Rear shock absorber assembled with 55Ibs Spring 1set Color Option: Black shock spring with Bronze air chamber