Features: 1) The hardness of the chrome coating for thin wall chrome plated liners can reach over HV800 2) The chrome coating of sponge structure is specially processed into platform honing channel structure containing excellent oil retention, which enables the chrome plated liners to reach quality standards of EURO II and EURO III and the wear resistance reach over 300 thousand kilometers 3) At the beginning of 2006 the liner passed the quality survey by Shanghai Internal Combustion Institute