Features: for most Chinese 50cc 125cc and 150cc atv go kart scooter and moped that use GY6 engine. Ignition Coil Whole Length: about 58cm Pin Number: 2 Pin This coil can improve combustion efficiency, strengthen electrical performance. Just replace and ride again, easy to install. CDI Box Size: about 66mm(L) x 38mm(W) x 22mm(H) Fitment: Fits GY6 50cc-150cc 139QMB, 152QMI and 157QMJ engines. Connector: AC, 6 Pin male plug The black CDI is a ignition module and also has a single stage advanced timing circuit, this means that you can get a faster response at top end if you use the black CDI. Please check the size measurement chart carefully before making payment. Color: Black Material: Plastic + Rubber + Metal Package Contents: 1 x Ignition coil 1 x CDI box Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.