8mm Swingarm Spools for Suzuki GSXR 600 750 1000 Hayabusa SV650 SV1000 GSXR600 GSXR750 GSXR1000 8 mm Swing arm Slider Spools by GPI Industries Each 8mm swingarm slider spool is precision CNC machined from High Impact DuPont Delrin Polymer resin Superior toughness and strength with reduced wear and friction during impact Lightweight yet strong and will not shatter or dig in when hitting pavement High grade steel mounting hardware. Each swingarm slider comes with a solid aluminum core for added strength Do not be fooled by cheaper, smaller spools that break off easily without aluminum cores and are made from plastic