The interchangeable O-rings fit many pressure washer wands, hoses and are fast. Made of NBR rubber. It is compatible with many chemicals and cleaning agents. Tearproof and abrasion resistant. Suitable for cold and warm pressure washer. Designed for 1/4 Inch, M22,3/8 Inch mount for quick splicing. Made of NBR rubber. It is compatible with many chemicals and cleaning agents. Tearproof and abrasion resistant. Suitable for cold and warm pressure washer. Color: BlackMaterial: RubberDimensions: Inner Diameter 9.2mm & 11.8mmPackage Contents: 20x1/4 Inch O-Rings20x3/8 Inch O-RingsOnly the above package content, other products are not included. Note: The light and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowed measurement error is +/- 1-3cm.