The faucet coil is made of high quality brass, which is durable and can be used for a long time. Red and blue O-rings at the bottom of the coil for easy identification and installation. Red = left closing (counterclockwise), blue = right closing (clockwise), M4 solid brass screws included. The faucet valve replacement has a black rubber lock washer, easy to remove for use, seals the faucet and prevents the faucet from leaking. Ideal for bathrooms, kitchens, fits almost all standard bathroom and kitchen fixtures. Description: The coil is made of high quality brass, durable and rustproof for long term use. Red O-ring below: 90° counterclockwise to open the valve, clockwise to close the valve. Usually used on the left side. Bottom of the blue O-ring: Turn 90 degrees clockwise to turn on the faucet, counterclockwise to turn off the faucet. Usually used on the right side. Specifications: Material: Copper Color: as shown Size: as shown Diameter: about 24mm Package includes: 4 x Ceramic