Silicone rubber tube - will withstand repeated use and for visual inspection of fluids. Size: 2x3mm / 0.08'x0.12'(IDxOD); Length: 1M(3.3'); Wall Thickness: 0.5mm(0.02') Operating Temperature: -76 to +428F; Hardness: 65 Degree; Good electrical and weather ability properties - resists u.V., ozone, gases, and moisture. Silicone tubing - great for fluid handling, peristaltic pumps, siphoning, draining, aquaponics and water/oil change, etc. Note: Silicone tube is much softer than pvc tube or nylon tube