Chang Yun India Limited offers Single or Multi Cone Synchroniser Rings. Chang Yun India Limited is an ISO/TS 16949: 2002 certified company. The Single or Multi Cone Synchroniser Rings drive gears and shafts in manual gearboxes, to ensure that equal evolutional speed between the shaft and the gear is reached while shifting. The male clutch member is on the gear and female on the dog clutch hub, which has a splinted outer sleeve. Continued movement of the selector causes the internal splints of the outer sleeve to engage with the dog teeth and the gear.