NCY 15X12 SLIDING ROLLER WEIGHTS FOR MINARELLI 50cc 2-STROKE ENGINES. THESE WEIGHTS ALSO FIT MANY SCOOTERS FROM INCLUDING ZUMA CW50, ZUMA 50F, VINO AND C3. HEAVIER ROLLER WEIGHTS= A SLOWER TAKE OFF SPEED WITH LESS ACCELERATION AND A HIGHER TOP SPEED LIGHTER ROLLER WEIGHTS = A FASTER TAKE OFF SPEED WITH MORE ACCELERATION AND LOWER TOP SPEED SIZE: 15X12 SET OF 6 INCLUDING HALF GRAM WEIGHTS EXCELLENT HEAT RESISTANCE LOW FRICTION / LOW WEAR LASTS LONGER THAN STANDARD ROLLER WEIGHTS PLEASE NOTE: WEIGHT COLOR MAY VARY