Molding and carving have never been so fun! Bubber is a soft compound that leaves clean, sharp lines and great imprints. It's non-toxic, leaves no stain or residue and never dries out, so you can play with it over and over.Bubber is the award-winning modeling. Bubber feels great in your hands and you can mold just about anything. Bubber is a super-soft compound that leaves clean, sharp lines and takes amazing imprints.