Dr. Pulley 17x12 Round Roller Weights Dr. Pulley 17x12 Round Roller Weights for Aprilia SR50 & SR Di Tech, Derbi Atlantis, Italjet Formula Lc, Malaguti Ciak and many more. Select weights on sale; 6g, 8g, 10g, 12g, 13g, 14g, and 15g.Please select weight from drop-down menu. Dr. Pulley Round Roller Weights have exceptional durability, heat resistance and are low friction and low wear.Please see our Warranty & Returns Policy. Size: 17x12 Set of 6 Lasts longer than standard roller weights