Made of natural rubber, Rubber content is not less than 50%, One-time shaped technolgy, Absolutely match with BS standard 1. BS1970-2006: Standard products.One-time shaped technique ensured the high quality and good appearance.2. One or double side diagonal, glossy and flexible. 3. Thickness 1. 4-1. 5mm, ID of the neck ≥18mm 4. Rubber content is not less than 50%, It was ensured that the tensile ...