Suitable for most (but not all) impulse sealing machines marked as "12-inch" or with "300" in the model number. Please verify your machine size matches the product dimensions before purchase. Heating elements are made of nickel chromium, offering high resistivity, low resistance temperature coefficient, high-temperature performance, good corrosion resistance, fast heating, durability, and resistance to breakage. Easy to install using a screwdriver on most machines. Replace old elements to improve bag sealing performance. Replace the kit when the PTFE cloth shows signs of wear, discoloration, or reduced sealing effectiveness. Ensure correct size compatibility before purchasing. Actual product may vary slightly in color due to lighting and display differences; this does not affect functionality. Color: As shown in photo Material: Nickel chromium Size: Approximately 34 cm Package Contents: 10 x Impulse sealer heating elements 10 x Cloth tapes Note: Light reflection and different displays may cause slight color variations. Measurement tolerance is +/- 1-3 cm.