MRS Plus Mare's evolution of the 1st mechanical weight system introduced to the market It incorporates a newly designed buckle system, one pull movement to release your weights, shaped pockets to form to your waist. Large, zippered opening allows for easier insertion of weights. Max load in the large size of 13 lbs. (6 kg) fitting medium, large and extra-large size BCD's and 8 lbs. (3.6 kg) for extra small and small BCD's. Velcro internal closures allow sectional stability when pockets not filled to capacity. This pair of weight pockets is designed for the Dragon, Dragon AT, Hybrid, Hybrid AT, Hybrid Pro-Tec, Hybrid Pure, Kaila Prestige MRS Plus, and Prestige AT BCD's (see SKU's: MRSDR, MRSH, MRSHW, MRSHAT, MRSHPT, MRSHP, and MRSPRM) Inside Velcro to section the pocket in case you don't use the full capacity. The most modern and reliable integrated weight system: spacious, simple, and easy to use Made of durable polyester 600 and ABS plastic material for long life.