Make of tinplate plating copper, does not contain any chemicall components, safe and can used safely and safely. Smooth lips , carefully polished great stainless steel watch covers, with exquisite patterns and multiple internal reinforcement screws to air leakage, making the lips more comfortable and smooth during use. Wide application ranges, great for , students, adults and beginners, small size, none suffocating dangerously parts or accessories, very easy to carry, and safe. It is excellent for holiday gifts.It is a good option to give it as a to fri-ends or . If you have any questions, us and we will do our best to serve you.