Features: High voice coil and sound film components with left and right wiring. Lightweight and portable. Designed as a tweeter speaker accessory. Note: The voice coil is made of silk film, which may deform when pressed on the front side. It can be restored by gently pressing from the back. This does not affect performance. If you are concerned, please do not purchase. Specifications: Voice coil DCR: 5.4Ω (compatible with 4.1-8Ω) Material: Tetoron Color: Black Size: (approx) 20mm sound film: Outer diameter 29mm / secondary outer diameter 26mm / full height 5mm 20mm voice coil: Inner diameter 20mm / height 4.5mm / roll width 1.6mm 25mm sound film: Outer diameter 38mm / secondary outer diameter 37mm / full height 7mm 25mm voice coil: Inner diameter 25.4mm / height 5mm / roll width 2.3mm Quantity: 1 Set (2 Pieces) (other accessories shown in the picture are not included) Note: 1. Conversion: 1cm = 10mm = 0.39inch 2. Please allow 0-1cm measurement deviation due to manual measurement. Ensure you are comfortable with this before purchasing. 3. Due to differences in monitor displays, the actual color of the item may vary from the image. Package includes: 2 Pieces Tweeters Diaphragm Voice Coil (no retail packaging)