BSTOPMIR.BK (Black) / BSTOPMIR.TN (Tan) Bionic Mirage Stoppers are appropriate for todays high-performance roller sports and the demanding skater.Mirage Stoppers are also suitable for OEM replacement parts. The unique cross-cut profile provides a better grip and bit for take-offs on jumps. So whether youre looking to stick a triple lutz or jump the apex at your next bout, the Mirage Stopper is up to the task! Perfect for: Artistic, Speed, Hockey, Derby-Flat/Banked Track High-performance stoppers for all skating surfaces: Plastic Wood/Coated Cement/Concrete Features include: 30mm stem length 5/8” x 18UNF stem thread American Standard Thread Crosscut profile (Sold in 2pk)