can make inner dia : 13.28mm, 14.7mm, 16.5mm ,19.45mm, 20.4mm , 25.5mm ,25.9mm ,30.5mm , 35.5mm , 38.6mm , 44.5mm , 49.5mm , 50.8mm , 60.5mm , 65.5mm , 75.5mm , 99.5mm , etc. we can make tools as your size .
DCR: 3.6ohm , it can change DCR as design . also can change double terminal design.
wire : EI wire , can change to : CCAW, EI , flat wire etc. wire dia accoding speaker design .
4 layer , can make 2 layer, 6layer.
bobbon: kapton,has hole , can change to: paper (small size), TIL , AL etc.