<b>All the leathers and machined parts are made of the highest quality materials.<br><br> Main parts Characteristics<br> The piston sleeve is made of ceramic steel. <br>The inner part of the cylinder sleeve is grinded many times,<br> making it as smooth as the mirror surface, <br>reducing the friction of the machine.<br> Increased machine efficiency.<br> The piston rod is made of fine steel. <br>After many times of casting, the hardness of the steel is more than 60, which has good wear resistance.<br> It greatly reduces the cost of repairing your machine. <br><br> GDHXW 16X414 Airless Pump，This pump is more powerful and wear-resistant than ordinary pumps<br> With a spare pump at the ready,you'll never have a down day.