Acetate and stainless steel and mineral glass</br></br>Product Description</br></br>Face: about 3.7 cm x 3.7 cm x thickness 1.1 cm / belt width: 1.8 cm arms around: about 17 cm / weight: about 100 g</br><br/>http://www.amazon.com/gp/product/B06XQPMDNZ