Made of natural rubber, rubber content 40%-60%, customermized color and OEM designs accepted, cotton cover available. Size:500cc, 800cc, 1000cc 1750cc, 2000cc. Features:1. BS1970-2006: Standard products. One-time shaped: New technique, it makes the neck has a good look.2. One or double side diagonal, glossy and flexible. 3. Thickness 1. 4-1. 5mm, ID of the neck ≥18mm 4. Rubber content 40%-60%, ...