3" Voice Coil 74.5mm Tweeter Diaphragm for DS18 PRO-D2, D2X, D2PH, DR2, DKH2, B&C DE75TN, DE750TN, DE82, DE82TN, DE85TN and Many Others Compression Driver 8 Ohm Voice Coil Diameter: 2.93" (74.5mm), Impedance: 8 Ohm The Center Distance Of The Two Post Terminals : 123mm Outer Ring Diameter: 106.7mm, Dome Height: 13.5mm Perfect matching with the original speaker driver Please check your speaker model and design before ordering to make sure you are getting the correct diaphragm