Tinksky Sponge Painting 24pcs Watercolor Sponge Shapes Early Learning Sponge for DIY Craft Painting(Random Pattern) 24 pieces of the sponge stamps will be sent in random colors and patterns. Material: soft sponge. Length: about 6cm; Thickness: 1.8cm. This set figure sponges are for kids graffiti. Great for kids to create words, pictures, arts and crafts. Can stimulate the kids give full play to the imagination, to map out a variety of different patterns. Thick figure sponges for educational painting fun. Fit for kids under 5 years old.