Double side coins, available in 10p format or 2p format.
Both formats available in double tails or double heads
Buy a tails coin and a heads of either 10p format or 2p format and get both coins for £15 , normally £10 Each
Or all 4 ,1 heads 2p, 1 tails 2p, 1 heads 10p and 1 tails 10p for only £27, £40 if bought individually.
Comes complete with a very simple routine to get you started.