Type: 0.1 2 12-18mm Ferrite Core Rod Coil./customized your own size Copper Wire Diameter: available wire copper size 0.0112-0.026MM(support customized) Coil Diameter:1 2.3MM(support customized) Coil Turns:20000TS( Support customized) Coil Shape:tube/oval/rectuangle/ roud( support customized) Bobbin:Plastic,Ferrite Rod/Magnet etc Customized Ferrite/Rod: Size,Shape customized Inductance:300â??500mh Support Customized Cost: USD 0.1-1.5/pcs With volume 10,0000 monthly. ChengPin Technology can using 0.0119mm wire diameter to manufacture 1-3mm mirco acoustic inductors Customized all size,shapes,inductance/resistance based on your requirements.