Body-Solid Gut Blaster Ab Slings Encourage superior toning, trimming and conditioning of the entire abdominal area without lower back strain These slings encourage superior toning, trimming and conditioning of the entire abdominal area without lower back strain. In fact, they can actually help a bad back by stretching the muscles and decompressing the spine. Features include solid steel Fire and Rescue Locking Carabiners that are rated at 10,000 lbs. capacity each. Arm slings are 8 1/2" wide with dense and durable 1" thick pads.