Cold Shrink Insulator, Medium Wall, Material EPDM Rubber, Flexible, Flame Retardant No, Adhesive Lined No, Shrink Ratio Not Rated, Use With Wire Size 250 MCM to 400 MCM, I.D. Before Shrinking 1.38 in, I.D. After Shrinking 0.67 in, Wall Thickness After Shrinking Not Applicable, Length 6 in, Shrink Tubing Properties UV Light , Color Black, Temp. Range -40 Degrees to 194 Degrees F, Package Style Individual Pieces, Dielectric Strength 1,000 V, Max. Temp. Rating 194 Degrees F