Brand New Performance Variator Weights Slider 18x14mm 11-gram set for GY6 125cc, 150cc Cooper core. These are probably the best bang for the buck if your still using those old round rollers in your variator. These will spread the load pressure to help broaden the range of variations as sticking is greatly reduced. So in the end, you will get the performance of a lighter and heavier weight roller, in one package, and last longer to boot.