Dr. Pulley sliding weights are the best variator weights you can buy.
From the Dr. Pulley website:
"Traditionally, gear ratio is changed by the up-and-down rolling movement of the roller weights in the ramp. Now the innovative Dr. Pulley Sliding Roller Weights “slide” up and down in the ramp to change the gear ratio.
This unique “sliding movement” not rolling provides exclusive advantages to make CVT perform excellently. No abnormal wear will occur, even when Dr. Pulley Sliding Roller Weights work in the high gear position."