Packaging The markers shall be packaged in boxes such that the vertical wall will not take a permanent set in excess of 15 degrees from true vertical wall with respect to the base. Adhesive The adhesive, factory-applied to the marker base, shall be a solid butyl rubber 0.125" (3.2 mm) thick, minimum 0.75" (19.0 mm) wide on 1.0" (25.4 mm) wide release paper.	Marker Body and  Reflective Colors Type Y-2 -- Amber 2-Way Type Y-1 -- Amber 1-Way Type W-2 -- White 2-Way Type W-1 -- White 1-Way Additional colors are available by special order. Staple(s): The staple(s) attaching the protective cover to the marker body shall be heavy duty type made of high carbon steel. Reflective Performance Reflective tape shall be affixed along the top of vertical section of the marker inside the I-beam on one or both sides. Reflective tapes shall be a cube-corner microprism material with the following minimum optical performance: Initial Brightness Color Grade SI CIL Yellow WZ 2.5 230 White WZ 3.5 320 Specific Intensity or Coefficient of Luminous Intensity at 0.2 observation angle and -4.0 entrance angle (in cd/ftc or mcd/lux)	Marker Body The marker body shall be made from .060" thick polyurethane which meets the following material specifications:   Property Results ASTM Test Method Specific Gravity (min) 1.19 D792 Hardness (min) 80A D2240 Tensile Strength (min psi) 4600 D412 Ultimate Elongation (min 96%) 330 D412 Modulus @ 300% (min psi) 1000 D412 Stiffness @-20ºF (min psi) @-72ºF (min psi) 1700 900 D1053 D1053 Compression Set 22 hrs @ 70ºC max 96% 65 D396 Tabor Abrasion CS17 wheel wt. loss mg/100 cycles 3   Protective Cover The protective cover shall be made from a clear flexible polyvinyl chloride which conforms to the following: Property Results ASTM Test Method Specific Gravity (min) 1.27 D792 Hardness (min) 80A D2240 Tensile Strength (min psi) 1900 D412 Ultimate Elongation (min %) 380 D412 Modulus @ 300% min psi 800 D412 Brittle Temp. ºF -20 D746