I recieved a letter from Rio informing me about some new products and one product was a 500 ft spool of type 8 sink tip. There plan is to have it available at fly shops so you can go in and get any custom length you want. They say the line weighs 14 grains per ft. I havn't figured out how much it will cost per ft. but I would guess it won't be to bad. It is available now so most shops should be getting it soon.