PrimoFlex Advanced LRT 3/8in. ID x 1/2in. OD Tubing Bundle (10ft pack) - Atomic UV Green Limited Edition Trusted/ExperiencedBrand (PrimoFlex LRT) Inner Diameter:3/8 inch / Outer Diameter:1/2 inch Inner Wall resilience Glass-like transparency (Clear LRT) / Logo Free (no print on tube) Environmentally responsible, safe and non toxic product