This stuff is good. Big plus, it doesn't stink like some plasticine. Useful for eg barbel and chub in snaggy swims as it pulls off the line where leads would be trapped. Can squeeze direct on line, or a lump on a hairgrip makes a running ledger. Can use it in all kinds of ways, eg in place of olivette to cock big floats, little bits will pin line to the bottom when fishing for carp. Cheap and available at many art supplies stockists.