Premium Set DR PULLEY of OEM Factory Rollers for CPI scooters made by Dr. Pulley in Taiwan factory set of 6 for JOG 50 and 90 ATV and Scooters such as the GTR 15X12 size grams 5.5 these nylon rollers are 20% faster than traditional carbon rollers and have less wear. Expect better performance from your scooter, period. No matter what stage you are in upgrading your scooter, simply add Dr. Pulley weights. The weights have several unique features such as their composite material containing nylon for better performance. -Made of unique material -Low Friction/Low Wear/High temperature resistance -Aluminum compatible -Fastest roller weights available SET OF 6 ROUND NYLON ROLLERS RETAIL PACKAGING SIMILAR TO UNI-RR-15X12-5.5GR MIINI QUAD RACERS PLEASE NOTE SIMILAR TO 4.5 IN TRADITIONAL CARBON Secondary: 213119003000