24 Pieces EVA Painting Sponges Foam Painting Stamper Double-Side Sponge Stamper for Kids Toddlers Early Learning and Crafts DIY, Assorted Shapes

Used these with my grandson on a preschool art project and they are great. Way better than the softer, flimsier sponges that came with another set I bought. The built-in grips keep little fingers (mostly) clean and make the sponges easy to handle.