Rocker can be new term/word for many of the people. It is a kind of play goods for kid that can be play like a see-saw. But is is quite different. It is fully made of fiberglass. There is 2 size with us i.e. small/single seater and big/four seater rocker. It can be clearly seen in the picture. It should be play in on carpet or artificial grass mat to prevent from damage/scratch. It is very much fun for kids to play. So there is good demand in Montessori and pre-school.