This is the ScubaPro S-TEK Pro Back Plate / Wing Harness System Features Molded Monprene pads cushion shoulders, waist and back for increased comfort. Shoulder buckle and D-ring heights can be adjusted to suit different torso lengths. 3D formed back plate features a softened organic shape, curved central profile and fully radiused edges for greater comfort EVO Angle webbing slots allow for a more natural webbing routing that increases diver comfort and reduces abrasion. Recessed Wing Nut Socket features S-Tek Ergo Nuts that are ergonomically designed to be used with cold, wet or gloved hands, easy to tighten/loosen and flush mounted to prevent suit abrasion. Recessed Wing Nut socket is also compatible with standard wing nuts. Back plate provides mounting points for trim weights, an argon tank mounting point and a convenient built-in carry handle. Branded silicone epaulet on the left shoulder and branded silicone guide bands keep inflator hose and straps in place. Three lift options: 30 LB - For convenience, the system is sold as a comprehensive kit including the Pro Harness with Back Plate, 30lb Donut Wing and Single Tank Adapter. 40 LB - For convenience, the system is sold as a complete kit for twin tank diving. Each kit includes a Pro Harness with Back Plate and a 40-lb Donut Wing. 60 LB - For convenience, the system is sold as a complete kit for twin tank diving. Each kit includes a Pro Harness with Back Plate and a 60-lb Donut Wing. Go beyond the limits of recreational diving with SCUBAPRO&';s S-Tek technical diving gear system, which re-invents the classic back plate and wing system (BPW) with a clever design focused on adjustability, reliability, and comfort. Built tough and loaded with features, this S-Tek Pro System includes a 3D-formed stainless steel backplate with harness and a donut wing with 30/40/60-pound lift. Offering a revolutionary design that will make your time at depth more comfortable and enjoyable, the back plate features adjustable TEK LOC shoulders to ensure a snug fit while the donut wing delivers reliable buoyancy control regardless of diving position thanks to its rounded profile. Comfortable and Convenient Back PlateThe 3D-formed back plate features a softened organic shape, curved central profile, and fully radiused edges for greater comfort.The S-Tek Pro Harness includes recessed Wing-Nut Sockets that are compatible with standard 8mm and 10mm Wing Nuts or the included S-Tek Ergo Nuts, which are designed to be used with cold, wet, or gloved hands. Durable Donut WingDelivering industry-leading abrasion resistance that&';s great for cave diving, the S-Tek Donut Wing&';s outer shell is made from durable, performance-oriented 1000D Cordura fabric, while the inner bladder is made from 500D Cordura.Additionally, the wing&';s rounded profile reduces air trapping, helping ensure smooth, controlled air migration. Smooth, Balanced Tek BPIThe S-Tek Donut Wing includes the Tek BPI (Balanced Power Inflator) with a K-style layout, providing an extremely robust, lightweight design for smooth, balanced air control during inflation and deflation.It features an easy-to-control balanced inflation button, a rotating soft mouthpiece for comfortable oral inflation, and an ergonomic design. "