Foam Spheres/Balls are solid, high density & heat reactive. Cut, Sculpt & create! 
Diameters range from 10mm to 50mm.
Does not react with solvents, which means you can use spray cans, solvent paints and solvent based glues.
Available in Packs of 10 (10mm, 15mm, 20mm, 30mm) & 6 (40mm, 50mm)