Piston Ring Std / Tecumseh ST500306Pack Size:1Tecnamotor 1610.0009, Tecumseh 28986, Tecumseh ST500306ESF 163-752, Foley/Belsaw 5961456, Foley/PLP 163-752, Green Meadow R76, Laser L5506, Laser 94136, Oregon 36-050, Prime Line 7-03724, Ratio Parts 007-003, Rotary 1456, Sunbelt SB-1456Tecumseh H30, LAV35, TVS75 and TVS90Cylinder Diameter: 2.500 ", Ethanol: Not compatible with greater than 10% ethanol fuel