you have any questions, us and we will do our best to serve you. premium tinplate plating copper , does not contain any chemical components, safe and , and can be used safely and safely. Smooth lips , carefully polished great stainless steel watch cover, with exquisite patterns and multiple internal reinforcement screws to air leakage, making the lips more comfortable and smooth during use. Wide application , very for ideal for , students, adults and beginners, small size, suffocating parts or accessories, very easy to carry, and safe. It is an excellent for holiday gifts.It is a good to give it as a to fri-ends or .