Classy material: The heating element is made of nickel chromium, featuring high resistivity, low resistance temperature coefficient, high-temperature resistance, durability, fast heating, and resistance to breakage. Easy to operate: Requires only a screwdriver for installation on most machines. Replace old elements to improve bag sealing performance. Replace the kit when the PTFE cloth shows wear, discoloration, or reduced sealing effectiveness. Appropriate size for use; please verify dimensions before purchase. Applicable for most machines with "400" in the model number, such as F-400. Type: 400 Type Color: Silver Material: Nickel chromium Size: 455 x 2mm Package Contents: 10 x Impulse sealer heating elements 10 x Corresponding cloth tapes Note: Light and display settings may cause slight color variations between the image and actual item. Measurement error allowance is +/- 1-3 cm.