The willow composite bow cannot be made using the Fletching skill, and is currently the only composite bow available for free players. They can also be obtained through trading with another player.
This bow shares its stats with the willow shieldbow, the only real differences being its attack range (one extra in comparison to the shieldbow) and its relative uncommonness. This bow was regarded a status symbol to Free-to-play players due to its rarity and price prior to 2010.
Years ago the Willow Composite Bow used to change colours. Depending on your hair colour, two bands on the bow would turn to the same colour of your hair. Jagex changed this after a while for an unknown reason. Whether it was a glitch or not is unknown.
The walk animation when wielding the bow is the same used when wielding a staff.