Nikkalite SUPER ENGINEER GRADE (ASTM D4956 Type 2) Reflective Tape (SEG) is twice as bright as standard engineer grade type 1 reflective tape and perfect for smooth surfaces like pipes, bollards, tailgates, fences, gates, or any other flat or single curve surface. Super Engineer Grade is 5.5 mils thick and has a permanent acrylic adhesive with a peel-off backing. It utilizes embedded retro-reflective glass beads to reflect light. Other common uses are markings on vehicles, bicycles, wheelchairs, bollards, fences and gates. It meets ASTM specifications D 4956 and LS-300C is resistant to weathering and fading and is rated for a 12-year outdoor life.