1. Material: silicone
2. Size: S, M, L, XL
3. Weight: S is about 58.5 grams, M is about 75.5 grams, L is about 92.5 grams, XL is about 115.5 grams
4. Length: S is about 10.9 cm, M is about 12.1 cm, L is about 13.3 cm, XL is about 14.5 cm
5. Height: S is about 6.5 cm, M is about 7.3 cm, L is about 8.1 cm, XL is about 8.9 cm
6. Features: safe material, soft and smooth, no mouth hurt, comfortable and wear-resistant, hollow design, free breathing, length can be adjusted appropriately, easy to wear