Dr. Pulley 16x34 Gliding Roller Weights, J. Costa Dr. Pulley 16x34 Gliding Roller Weights for the J.Costa XRP Variator on their Yamaha TMAX Scooter. Select weights on sale; 15.5g and 16.5g. Please select weight from drop-down menu. Available in 15.5g through 20g weight options. Dr. Pulley Gliding Roller Weights have exceptional durability, heat resistance and are low friction and low wear.Please see our Warranty & Returns Policy. Size: 16x34 Set of 16 Exceptional Heat Resistance Low Friction/Low Wear Lasts longer than standard ro ller weights Select weights on sale; 15.5g and 16.5g. Note: Does not fit J.Costa PRO or ProRacer.