The pellets are probably either what is called Plastiform (if they
are white in color), or Jett Sett if they have more of a earthy tone.
Either way put some of the pellets in hot water. The Plastiform will
turn clear when ready to take out of the water and use. I am unsure
about what visual characteristics take place with the Jett Sett, but
both will turn pliable when heated in water. Once soft enough to work
take the mass that was in pellet form and work with it like clay to
mold, or support nearly any object for further work.
I use the material for holding odd shaped objects for stone setting.
You can also use either material to form metal into, create a handle
for a graver, a mallet head… nearly anything.
One of the great things about the products is that it doesn’t really
go bad. You can reuse it over and over again… though it will get
dirty with use.