Simply stated…they stick! No glue, no paste, no mess. Just press them down with light fingertip pressure and they will adhere to almost any smooth surface. Made of hand-knitting yarn enhanced with a microcrystalline food-grade, non-toxic wax. They do not contain latex, gluten, nor peanut or other nut oils or by-products which makes them an ideal creative activity toy for children with allergies. Includes bright primary colours and idea guide.