12 Inch Natural Wood Nunchaku Grip Grooves. Add a high-quality pair of Nunchaku to your martial arts school or just for yourself. Made of a sturdy natural round hardwood with grooves on the handles, these will last for years to come, even with abuse. They have a metal ball bearing chain and are 12” in overall length. High-quality is what you want when you're looking for martial arts tools. Look no further!