Features: Distance from center of column: 124mm / 4.88 '' (approx) Aluminum Diameter: 86mm / 3.38 '' (Approx) Balloon Top Height: 9.5mm / 0.20 '' (approx) Outside Diameter 109mm / 4.29 '' (Approx) Sound film material: for titanium film Coil material: copper round wire Spool Diameter: 75mm (74.5mm) / 2.95 '' (approx) Quantity: 1 Pc The pattern around the for titanium film is random, please do not place an order if you mind. Specifications: Sound film material:Titanium Film Coil material: Copper Round Wire Color: as pictures Coil diameter: 75mm(74.5mm)/2.95''(approx.) Column center distance: 124mm/4.88''(approx.) Aluminum diameter: 86mm/3.38''(approx.) Ball top height: 9.5mm/0.20''(approx.) Outer diameter 109mm/4.29''(approx.) Quantity:1Pc Note: No retail package. Transition: 1cm=10mm=0.39inch Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x Treble Voice Coil Reel (other accessories demo in the picture is not included.)