PPE's Silicone Hoses are resistant to fuel, oil, and chemicals while also being UV and Ozone resistant. PPE 6mm Performance Silicone Hoses are reinforced with 5 plies of Nomex fibers which allows them to handle 200+ psi burst pressure rating. The Fluorocarbon lining offers better lubricity (slippery and resistant to chemicals). This kit also features stainless steel worm-drive clamps for a secure fit. .