PrimoChilll 1/2in. Rigid Acrylic Tube 24in. - Colored - 4 Pack (UV Red/Orange) Primoflex Trusted/Experienced Brand Glass Like Transparency, Virgin PMMA Material 15 Vivid Colors to choose from Compatible with PrimoChill Rigid Ghost compression fittings Inner Diameter: 3/8in. , Outer Diameter: 1/2in. , Wall Thickness: 1/16in.