There are 4 kinds of model to choose:
1. black (matt)
2. black (glossy)
3. gold-colored
4. silver-colored
Diameter: 17.1 mm
Material: alloy
If you buy this product with another product or you buy more than one, you will get discount for shipping fee. Just pay the total amount and I will refund the shipping fee excess to your account within 1-2 days.
