1X-long hooks are about one eye length longer than the standard shank length. They are used for slightly longer wet flies, which give them a more natural dimension, considering that wet flies represent mayflies, which are long-bodied insects. They are also a reasonable length for mayfly nymph imitations or wet flies featuring a bead head.
The hooks are made of the finest high-carbon steel, which is hardened and tempered to an exacting formula that makes for a long point life and a very strong hook. Daiichi hooks use a 12-degree constant taper ground needle point. This eliminates irregularities in shape, assuring no weak spots, and gives amazing speed of penetration.