The strap is manufactured from high-quality resin rubber, which has a medium firmness. It has greater strength than regular rubber straps, is resistant to water and sweat, and provides comfort and durability. Compatible with AE-1000w series, AQ-S810W series, SGW400H, SGW-300H, SGW-500H, AQ-S800W, AQ-S810W, AE-1100W, AE-1200WH, W-S210H, W-S200H. Not compatible with any other models. Crafted from non-allergenic, water-resistant natural resin. Features non-slip lines on the back. Designed ergonomically for enhanced wearing comfort. Strap size for replacement: width at the interface is 18mm, widest position of the strap is 25.5mm. Length: 135mm / 80mm. Includes: 1 set of straps, 1 tool, 2 spring rods. Allows for easy and quick installation and band change. While most individuals can do this manually, we provide tools to assist with your needs.