Classy material: the heating elements is made of , features with high resistivity, low resistance temperature coefficient, high temperature of use, good resistance against high temperature, fast heating, durability and not easy to break Suitable for most (but not all) impulse sealing machines that are marked "12-inch" machines or have "300" as part of their model number, please make sure that the size of your sealing machine is consistent with the product size! Easy to operate: require just a screwdriver for installation on most machines, try to change the old elements to have a better bag sealing function in daily use, replace the kit when the PTFE (cloth) is warning, changing color, or the seal effect is not good