Suitable for most (but not all) impulse sealing machines labeled 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 heat tolerance, good corrosion resistance at elevated temperatures, fast heating, durability, and reduced risk of breakage. Easy to install using a screwdriver on most models. Replace old elements to improve bag sealing performance. Replace the kit when the PTFE cloth shows signs of wear, discoloration, or reduced sealing effectiveness. Please check the size carefully 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 allowance is +/- 1-3 cm.