These System Half balls are 100 mm in diameter and are actually a little over half at 65 mm in depth.
These are the half balls for your Door Jamb or Base Station
System Half Balls are manufactured with precision for a tough but rewarding training experience in open hand pinch training.
Setup on a campus board is where they are most effective. In conjunction with Awesome Woodys Sloper rails and campus rails they create the epic training
They can also be used as a stand alone set on your Door Jamb or Base Station or also as regular holds on your bouldering wall.