more than 16 years of experience in the development and productions of rollers and hardware parts for bathroom,make our products easier to install and safer.The roller lifetime tests have million times. The material of bearing use the stainless steel make our roller anti-rust, the concentricity of roller less than 0.03 mm,make the roller smoother and low noise.Patent design let the structural 100% safety.we guarantee 100% products get inspection before leave the factory.