10 X FishFry head masks, each contains 10 masks and 20 eyes as the selected option in the pictures. Why not add these masks to you flies to give the perfect finish, transparent clear ABS injection moulded plastic making them very durable, each head comes with 2 snake look eyes. Best way to get them to fit your fly head perfectly is to keep trying it for the size fit as you are tying, then set with UV resin and give the eyes a coating too to really set the eyes in place, remember for your more bulky flies where you want the fibres to remain full bodied fit the heads as close to the hook eye as possible as if the head is pushed on tight over the fibres it will make the fly go slim.