1. Material: stainless steel
2. Single diameter: No. 6 is about 16.5 mm, No. 7 is about 17.3 mm, No. 8 is about 18.2 mm, No. 9 is about 18.9 mm, No. 10 is about 19.8 mm, No. 11 is about 20.7 mm, No. 12 is about 21.3 mm, No. 13 is about 22.1mm
3. Single circumference: No. 6 is about 5.3 cm, No. 7 is about 5.6 cm, No. 8 is about 5.9 cm, No. 9 is about 6.2 cm, No. 10 is about 6.5 cm, No. 11 is about 6.8 cm, No. 12 is about 7.1 cm, No. 13 is about 7.1 cm About 7.5 cm
4. Weight: about 7 grams/piece
5. Applicable gender: both male and female
6. Function: body temperature sensor display
7. Features: unique shape, beautiful and exquisite, intelligent temperature sensing, versatile personality, solid material, not easy to wear, no color, not easy to scratch, comfortable to wear