Powerslide Precision Spacers are made of 6061 aircraft aluminum. They fit all common inline skates featuring axles with 8mm diameter and all common wheels that have a total core width of 24mm. The spacers are 10,39mm (+/- 0,02mm) wide. Feature 1: 6061 Aluminum", "Segments: Inline Skating, Racing", "Net weight (kg): 0.002", "Gross weight (kg): 0.002", "Packaging Size: x x ", "Weight: 0.002", "VPE Packaging: x x ", "Warranty: 2 Years", "Release Year: 18