The item is a simple and fashion finger ring, which is mainly made of titanium steel, and it adopts numbers color changing designed on the ring to make it more charming. It is suitable for both men and women to wear. Features - Color: Black. - Material: Titanium steel . - Size No.6 About 1.6x1.6x0.8cm. No.7 About 1.7x1.7x0.8cm. No.8 About 1.8x1.8x0.8cm. No.9 About 1.x1.9x0.8cm. No.10 About 2x2x0.8cm. No.11 About 2.1x2.1x0.8cm. No.12 About 2.2x2.2x0.8cm. No.13 About 2.3x2.3x0.8cm. - This round ring is made of titanium steel which is rusty free and hard to deform,is a long lasting jewelry. - This color change mood ring use simply can change color which is funny ring to wear at party. - This temperature ring can sense your body temperature and change its color and the ring surface is marked with centigrade degree number. - Lightweight and funny, suitable for many occasionas and can be wore at any season. - Warm Tip: Dear buyer, due to lighting effect, monitor's brightness, manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand Thank you