Tungsten Putty is a non-hardening, moldable material made from tungsten powder and a polymer binder. Under normal conditions.
Tungsten Putty can be easily used for fine-tuning the weight of pine derby cars. Simply pinch off a piece of the putty, knead it until it is pliable, and press the putty into a cavity or hole in the car.
Although tungsten putty is made from non-toxic ingredients, it is NOT a toy for children to play with. Always wash your hands after use, and keep it away from food and your mouth.
When you use it in fishing, you can adjust weight freely until you satisfied with it. it is reuseable.
It will not catched by rock. long life product.