Kids love BLO pen\'s as they can easily create fantastic pictures with amazing airbrush effects! with this puppies and kittens set there are 6 great stencils to create some wonderful pictures. Just put a stencil on a sheet of paper, blow in the pen and see your drawing appear! blow in lines and circles as well as blowing harder and softer for different effects. Then use the same pens to add extra detail for a perfect finishing touch! BLO pens caps are washable and interchangeable. They are completely safe for children to use, with non-toxic ink. Suitable for ages 3+ Contains 6 reusable stencils. 8 Blopens. washable and interchangeable