Pre-cut 1/16" and 1/8" OD polymeric tubing is square cut and ready to use. Each package contains one piece of the specified length: 10, 25, or 100 feet; 5, 10, or 25 meters. Fluorinated ethylene propylene (FEP) is another member of the fluorocarbon family with similar chemical properties. It is generally more rigid than PTFE, with somewhat increased tensile strength. It is typically more transparent than PTFE, slightly less porous, and less permeable to oxygen. FEP is not as subject to compressive creep at room temperature as PTFE, and because of its slightly higher coefficient of friction is easier to retain in a compression fitting.