1.Material: The cover is PVC, with the aluminum alloy support inside. 2.Size: The diameter is 38 mm, and the thickness of Al-alloy is 1.6/ 1.8 mm. 3.Color: As you like, you can choose any color as per the PANTONE number. Special color can be customized. 4.Feature: Tubular design, easy to grip, more confortable and beautiful. 5. Certifications: CE/ TUV/ SGS, etc.