Improved model, the #237-P Professional Throwline Bag is constructed from UV resistant polyester. It contains an Ethafoam flotation insert and a quick release buckle on the handle strap. Each professional bag contains 75′ of 1/2” Water Rescue Rope (#503), with a 16-strand kernmantle construction for improved grip and abrasion protection. If you’re in the Coast Guard and recently received our rescue throw line – Part # 237-P – you may have noticed it looks different than it used to. We promise; it’s the same thing, only better. In the last year alone we’ve shipped over fifteen-hundred 237-P Rescue Throwlines around the world. Always striving to make our products better, we’ve listened to customer feedback and came up with improvements for the device. The part number hasn’t changed, the price is the same, we just made your 237-P better!