Constructed of heavy duty 4 mil black carbon impregnated Low Density Polyethylene (LDPE) film to create an extra strong static barrierMeets specifications of MIL-P-82646, Rev. ANeatly wound on a 3" core with 1" diameter core plug.750/Rollil, 4x750Constructed of heavy duty 4 mil black carbon impregnated Low Density Polyethylene (LDPE) film to create an extra strong static barrierMeets specifications of MIL-P-82646, Rev. ANeatly wound on a 3" core with 1" diameter core plug.Staples Black Conductive Tubing 4 mil, 4x750http://s7d5.scene7.com/is/image/Staples/s0506804_sc7?$std$http://s7d5.scene7.com/is/image/Staples/s0506804_sc7?$thb$http://s7d5.scene7.com/is/image/Staples/s0506804/Staples-Black-Conductive-Tubing-4-mil-4x750/product_361422Staples Black Conductive Tubing 4 mil, 4x7500.00