%高手进来帮忙翻译成英语，多谢多谢。有高分追加

Would you please confirm something related?
1.What you need is just the plastic of the products or the products that are combined plastic with aluminums. Please confirm the fact in the letter.
2.Please tell me the size of aluminum of the products you need (diameter, height, the thickness of the aluminum) or international standard (diameter 20.2 MMs, inside height 7.2 MMs), if what you need is the products that are combined plastic with aluminums.
3.I am afraid that I can not quite understand what you say in your last letter about "And put an invoice "Free of charge" and cost 40-50$". Please give me you detailed instruction in your reply.
4.We have all of other related healthy certificate. And I will place the files you need in the first partial goods.