女国产女AV百合大片在线观看_异族女人性变态另类_草莓视频最新版网站下载免费_主播国产 欧美_液液酱白丝JK开腿自慰_国产片亚洲永久免费AV_中文字幕人妻毛片av_娇喘h校园h乳尖h_日韩动漫在线播放一区_艳妇乳肉豪妇荡乳后续黄蓉

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.