HPI Thin 34mm Piston Ring (0.7mm) $19.99 Quantity discounts available QuantityPrice Quantity: -+ SKU: HPI15488 ABOUT THIS PRODUCT:HPI Thin 34mm Piston Ring (0.7mm)AboutAboutHPI 34mm piston ring (extra thin, 0.7mm thickness). Works on CY pistons with 34mm bore, designed specifically for the HPI pistons with .7 groove thickness. HPI part #15488.