One inner torus with windings to fit into two halfs of the bigger torus. Dimensions of the inner torus are diameter 108,8mm on 21,06mm height. Dimesionsof the bigger torus are diameter 180mm on 70,7mm height. For wire windings I took 12 strands of 0,3mm isolated copper wire, inner torus about 9m before drilling, outer torus 17m before drilling. I partially glued the drilled wire, specially 3d printed clips for fixing.