CARTMAN Booster Cable 4 Gauge x 20Ft in Carry Bag (4AWG x 20Ft) UL-Listed 5 Years Warranty! Fits top and side post batteries. Sufficient CCA. Twice grip design for better conductivity and tension. UL listed and stamped. Ideal for use with full size cars and cargo vans, mid-size pickup truck and freight hauling vehicles. Patented design of inside tongue for double connection with battery terminal. TPR material of cable, low temperature resistance (-25C/-13F). Luxurious carry bag for free. T-Prene coating keeps cables flexible down to -25C/-13F Cables work with top-post and side-terminal 12/24-volt batteries 4-gauge, heavy-duty, no-tangle cable construction Ergonomically designed with shielded surfaces for safety UL listed; RoHS compliant Low Temperature Test: To make sure the jacket material meets SAE or UL specifications for flexibility and high voltage leaks. Dielectric Test: To test the resistance voltage of cable/clamp insulations, and ensure safety. Aging (High Temperature) Test: To judge the aging performance of the insulation materials of the cable/clamp or others. Ampacity Test: To judge the booster cable set rating performance. Acid Exposure Test: To judge the acid resistance of the clamp plating. Flame Test: To judge fire retardant properties of the cable insulation or clamp (usually plastic clamp). Resistance Test: To judge the electric performance of the cable. To check the conductivity of the cable. To check the quality of the copper. Pull-out Test: To test the connection (crimping) between the jaw and cable.