TDK Datasheet for WR202010-18M8-SM (2016-08-01) = Dimension of coil unit = 1.Air Coil 2.Adhesive Tape 3.Polymer Sheet = Electrical Characteristics= Ls [uH] : 10.68 uH +/- 5% @1MHz Rs [Ohm] : 2.96 +/-10% @1MHz Rdc [Ohm] : 0.35 typ Wireless Charging page1 (c) TDK Corporation 2016