The Lifesaver Plus features a 4-blade cartridge housed inside the body of the cutter, with easy access to quickly change blades. We also have kept our popular built in O2 wrench. The Lifesaver Plus cuts quickly through restraining belts, clothes, etc., faster and safer than scissors. The cutter is easy to grip, even while wearing gloves, and is made with high impact plastic with a surgical stainless blade. Lightweight, rugged and durable, it is approximately 63/4" x 11/4". Replacement cartridges are available.