The Enterprise Hook Skins – Silt & Gravel is designed primarily to disguise the bare hook, when using hair rigged baits The hook skins also resemble a pupa/larvae which form part of a fishes natural diet. By blending in with the bottom colour and eliminating glint from the sun. By using the hook skins could give the angler an advantage. They can also be used as a bait. The pack includes two colours for use over silt or gravel.