The 24 color bag was designed with additional colors to include trees and flowers, water and wave! Perfect for designing more intricate art! It will be SOY much fun to color fantastic seascapes and landscapes. Crayon Rocks are simply the best coloring tool for all ages! They are vibrantly colored and make beautifully textured artwork similar to oil pastels. These all-natural soy wax crayons are made from USA grown soybeans and colored with non-toxic pigment powders. They are designed to strengthen the tripod grip muscles, preparing fingers and hands for handwriting.