1. Material: Silicone
2. Comfortable to wear, the length can be adjusted
3. The material is not harmful to human skin and is not allergic
4. Size: 38/40/41mm: (83mm+121mm) x 20mm, 42/44/45mm :(85mm+126mm) x22mm
5. Weight: 38/40/41mm: 16.3g, 42/44/45mm: 17.5g
6. Note: Host not included
