This is a very nice quality secondary slider for the 50cc GY6 QMB139 engines The slider is made by NCY, the premium name in excellent aftermarket scooter parts and accessoriesDescription This is a very nice quality secondary slider for the 50cc GY6 QMB139 engines. The slider is made by NCY, the premium name in excellent aftermarket scooter parts and accessories.Let Monster Scooter Parts be your source for NCY scooter parts and accessories.1200-1057 ? WARNING California Residents: Proposition 65 Warning