clearance lettering – non reflective black letter tape clearance lettering includes inclearancein lettering and height numbers in black non-reflective colors. Helps effectively warn drivers against accidental collisions in warehouse, car wash, drive-thru, parking lot and other low clearance applications. note: please specify exact clearance height in feet and inches lettering will read clearance x’-xx. please call 800 645-1232 for details. 5 year limited warranty.