PrimoFlex Advanced LRT 1/2in. ID x 3/4in. OD Tubing Bundle (10ft pack) - Bloodshed Red Trusted/ExperiencedBrand (PrimoFlex LRT) Inner Diameter:1/2 inch / Outer Diameter:3/4 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