It looks like a 5.1cm water-filled ball until you throw it against the wall, then it turns into a splat egg! A cute novelty toy, and fun to demonstrate. You can throw 'em, toss 'em, drop 'em, and the toy splats and then comes back to it's original shape! These SplatBacks are very durable and will provide long lasting fun as long as you adhere to a few simple guidelines. It is very important that you explain these guidelines to your children. SplatBacks were designed to be indoor toys. If your SplatBacks are thrown on concrete or other rough surfaces they will likely break. SplatBacks are recommended for indoor use only. Also, allowing the SplatBacks to return to their original shape before retrieving it will increase it's lifespan. Pulling them too quickly from a surface before it's been allowed to reshape weakens the plastic and shortens the life of the product. Be careful not to throw SplatBacks against anything with an edge, such as corners of appliances, furniture, and moulding as they may burst. When your SplatBacks lose their sticking or expanding ability, simply wash with warm soapy water and dry them.