You get 481 turns on the primary coil, 3800 on the secondary (both ±10%). We mounted both coils on plastic spools, with 2 binding posts on each coil. Square bases come on both secondary coil ends-and on one primary coil end--so you can slide it inside the secondary coil. Comes with soft iron core for induction studies. Requires a galvanometer and bar magnets, sold separately. Height: 12.5cm high.