英语翻译Do you have anything that shows the materials of constru

英语翻译
Do you have anything that shows the materials of construction of the HP120,especially the wetted parts (cylinder,piston head,etc…).
Thomas Industries used to coat their piston head with something and we have a potential big customer who might want to switch from Thomas because they changed their material specifications.
美国发来的邮件，我们公司生产真空设备的，HP120是一种无油真空泵，我猜想发邮件的人是不是想问HP120的零件材质。