1. The second generation delivery cylinder between the chrome layer and the substrate adds a layer of hardened layer (0.4mm or more), increasing the thickness of the wear layer, making it longer than the first-generation delivery cylinder increased nearly 2-fold.

2. The second-generation delivery cylinder reduces the chance of injury, or even eliminate the strain, so chrome layer can even wear.

3. After the second generation delivery cylinder wear layer chrome finish, can continue to be used.