Classy material: the heating elements is made of Nickel chromium, features with high resistivity, low resistance temperature coefficient, high temperature of use, good corrosion resistance against high temperature, fast heating, durability and not easy to break Easy to operate: require just a screwdriver suitable 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 Appropriate size to use, please check the size carefully besuitable fore purchase Applicable situations: suitable suitable for most machines with the number 400 as part of their model number, suitable for example, compatible with F-400, -400, -400 Type: 400 Type Colour: Silver Material: Nickel chromium Size: 455 x 2mm Package Contents: 10 x impulse sealer heating elements 10 x corresponding cloth tapes Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.