2 years & up. These stone roller sets are easy for children to use when creating patterns and prints in dough, sand, and dirt. Each roller is almost 3" long and sized for small hands. Roll to create a pattern, and then stamp a corresponding insect or animal throughout to create a tactile work of art. Each set includes 6 different rollers. There are four sets to choose from: Garden Bugs, Forest Friends, Ocean Life, and Pond Life. Sets are sold separately.