Table 1 MagVenture MC-B35 Butterfly Coil dimensions according to manufacturer's website (February 24, 2016) and private conversation with the manufacturer's representative.

From: Individual head models for estimating the TMS-induced electric field in rat brain

Inner winding diameter

24 mm

Outer winding diameter

47 mm

Wire thickness

9 mm

Insulation thickness between wires and the coil bottom

2 mm

Number of turns

Two wings, with three layers of four turns each