Dr. Pulley Sliding Roller Weights 19x17 (8g) Size: 19x17, Set of 6 Fits Aprilia Atlantic Eu3, Aprilia Mojito, Aprilia Scarabeo Light, Aprilia Sport City, Italjet Dragster, Piaggio Vespa and many more. Increases acceleration and re-acceleration properties Broadens your range of gear ratios; Increases top end speed Lasts longer than standard roller weights