. Specification: 26.3 x 8 x 13.65 mm . Density of piston: more than 6.3 g/cm3 . Hardness: 60-70 HB . Efficient steam treatment . High precision. . 900pcs per carton . Carton size: 27.5 x 22.5 x 18.5 . Gross weight: 24.5 kg . Net weight: 24 kg . Packing dozens of cartons per pallet . 7-8 pallets per container.