CFF Pit Bull Wood Olympic Gym Rings with Numbered Straps Extra Grip, 18-Feet Wood rings provide the extra grip you need when you start to sweat Were constructed with a muscle up in mind Holds chalk extremely well 1.5" wide straps with measurements, marking every three Inch so that adjusting is always quick and accurate Comes with oversized industrial spring clamps so that you are secure and the rings are not going to move