PrimoFlex Advanced LRT 3/8in. ID x 5/8in. OD Tubing Bundle (10ft pack) - Onyx Black Trusted/ExperiencedBrand (PrimoFlex LRT) Inner Diameter:3/8 inch / Outer Diameter:5/8 inch Includes FREE Liquid Utopiaand SysPrepCooling Loop Pre-Treatment Glass-like transparency (Clear LRT) / Logo Free (no print on tube) Environmentally responsible, safe and non toxic product