2 pins = 10 sets = 20 pieces (10 pieces male + 10 pieces female). 3Pin = 10Sets = 20Pcs (10Pcs Male + 10Pcs Female). 4 pins = 10 sets = 20 pieces (10 pieces male + 10 pieces female). 5 pins = 10 sets = 20 pieces (10 pieces male + 10 pieces female).