Traditional nunchaku are made from a strong, flexible hardwood such as oak, loquat or pasania.
Originally, the wood would be submerged in mud for several years, where lack of oxygen and optimal acidity prevented rotting and caused the wood to harden. The rope is made from horsehair. Finally, the wood is very finely sanded and rubbed with an oil or stain for preservation. Today, such nunchaku are often varnished or painted for display purposes. This practice tends to reduce the grip and make the weapon harder to handle, and so is not advised for a combat weapon.
Modern nunchaku can be made from any suitable material, such as wood, metal, or almost any plastic, fiberglass or other hard substance. Toy and practice nunchaku are commonly covered with foam to prevent self-injury or the injury of others. It is not uncommon to see modern nunchaku made from light metals such as aluminum. Modern equivalents of the rope are nylon cord or metal chains on ball bearing joints. Simple nunchaku may be easily constructed from wooden dowels and a short length of chain.