Do not purchase these for your small child. Although they appear to be the proper size for little fine-motor-skill-challenged children, like Josh, they are not good. I now am sporting blue and green fingers and have a really nice spot on our living room floor where he touched the carpet with them while trying very sweetly to color Thomas the Train blue. They work just like markers, but are disguised as twistable crayons.
I do have to give him props for picking the correct color for Thomas.