Gut Blaster Slings are making a difference. 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. They won't wear out like cheap, soft aluminum snap-on hooks. Arm slings are 8 1/2" wide with dense and durable 1" thick pads. Extensively tested in gyms, they've been proven to help your back and build a well-chiseled set of abs!