Fly Fishing Outpost tungsten putty is a "must-have" for nymph fishing under an indicator. Because it is easily removable, you can change the depths of your flies as water depths and conditions change, without having to add and remove split shots (a real pain in the butt). Being both biodegradable and reusable, tungsten putty is an environmentally friendly alternative to lead based weights. 1½" puck. 25 grams.