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 purchasing. Heating elements are made of nickel chromium, offering high resistivity, low resistance temperature coefficient, high-temperature performance, good corrosion resistance, fast heating, and durability. Easy to install with just a screwdriver on most machines. Replace old elements to improve sealing performance. Replace the kit when the PTFE cloth shows wear, discoloration, or reduced sealing effectiveness. Please check the size carefully before purchase. 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: The actual product may vary slightly in color due to lighting and display differences, which does not affect functionality. Measurement error is +/- 1-3 cm.