... smooth, good heat dissipation. 2.the material of the cylinder block are good metallographic.3. cylinder usedoverlapping curve in Cylinder hole ... .4. Precise machining size, Precise processing dimensional accuracy and has a good match with piston.5.Competitive price ,promptly delivery6.Various ... (Except China), North America, Central & South America ceramic scooter cylinder block MINARELLI A/C(V)