Boker 09BO071 SO4PRO-K Pocket Stick, Titanium. These new SO4PRO-K Pocket Stick has been developed as innovative alternative to other koppo sticks available by Ranier Wenning for Boker. Designed for defensive use, as well as a capable massage tool for relaxation of muscle tightness using the innovative rounded tip. The double finger loop in the middle of the shaft allows you to hold the koppo and use your hands without having to put the koppo down, and prevents dropping or losing the koppo while using it in a defensive situation. A very effective and versatile tool! This exclusive version is made entirely of Grade 4 titanium. Overall length: 5 1/4.