Classy material: The heating element is made of nickel chromium, featuring high resistivity, low resistance temperature coefficient, high-temperature tolerance, good resistance to oxidation at elevated temperatures, fast heating, durability, and resistance to breakage. Easy to operate: Requires only a screwdriver for installation on most machines. Replace the old element to improve bag sealing performance during daily use. Replace the kit when the PTFE cloth shows signs of wear, discoloration, or reduced sealing efficiency. Appropriate size for use; please verify dimensions carefully before purchase. Applicable situations: Suitable for most machines with "400" in their model number, such as F-400, -400, and 400 Type. 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 Only the above items are included; other products are not included. Note: Lighting and display settings may cause slight variations in color between the image and the actual item. Measurement error allowance is +/- 1-3 cm.