Profile: Usha Liner (Shapar) Pvt. Ltd. offers centrifugal cylinder liners, sleeves and air-cooled blocks. Our piston rings are individually cast and close material control ensures high tensile strength, resistance to wear and scuffing. Each ring is double turned & ground to maximum accuracy for smoother performance and low fuel consumption. Our Gudgeon pins/piston pins for single cylinder engine applications are made from 15MnCr3 grade steel alloy.