Engine Model:WEICHAI,SINOTRUK,KOMATSU, CATERPILLAR, CUMMINS,VOLVO PISTON RING for WEICHAI,SINOTRUK, Komatsu, CATERPILLAR, CUMMINS or VOLVOpiston ringO-ring;oil seal - ... no requirements,we offer the Corrugated Carton and vellum paper diesel engine piston ring for WEICHAI YUCHAI DONGFENG KOMATSU CATERPILLAR CUMMINS VOLVO