MINISTOPPER for Dance and Jam in Natural RubberThread Types Available: Metric (White) and US Threads (Natural) (Please Specify Color and/or Thread type when Ordering) The Ministopper have a metal Threaded StemColors Available: Natural (also sometimes called Brown or Amber) are the US Threads, White are the Metric ThreadsAbrasion: 5 StarGrip: 5 StarResiliency: 6 Star The Roll-Line MINISTOPPER are the BEST choice for MINI Stops for ALL Levels of Dance and Jam Skaters . The Ministopper available from SkatesUS.com use an imbedded metal stud to mate with the frame properly. The MINI Stoppers have all of the very good characteristics needed in Toe Stops, Abrasion, Grip, and Resiliency, all 5 and 6 Star performance. The Roll-Line MINISTOPPER are available in both Metric (in White) and US Threads (in Natural). All Roll-Line Frames have Metric Toe Stop Threads. ATLAS, Snyder, and Sure Grip use US Threads.