The resin impregnation makes the wood completely weather proof. The seats are made of various hardwoods and create a distinctive looking rod. I've never used these seats, but have used dynawood trim rings in handle assemblies, and they are extremely tough and beautiful to look at. If you are looking to set a rod apart, using one of these seats would be a step in the right direction. Resin impregnated hardwood reel seats offer an alternative for those looking to create a unique look to their custom rod.
Size refers to the inside diameter, in millimeters, of the tube that the reel seat is built around.
For freshwater applications, there are 3 sizes that should fill almost every application you will run into. The smaller the I.D. of the tube, the smaller the hood size, and the smaller the reel you expect to mount on it. The small diameter of the tube creates a smaller hood that snugs down well to those little feet you find on ultralight reels and light baitcasters. Also a good size to use on lightweight flyrods. 17 mm Good for light to heavy weight rods.