The  Caster Board or castor board as it may sometimes be called is a made up to 2 small narrow platforms to which as set of caster trucks have been attached at the front of it. 

As you will soon discover if you decide to purchase a caster board such as the Ripstik you will find that no longer do you need to step on to it with one foot and push off with the other to gain momentum.

 

 

You will find that the  Ripstik version is available for around $99 to $129 and comes in a variety of different colors.  A person when riding these boards is able to either make their way downhill just as a snowboarder would or they can easily make it uphill as well in much the same way as skateboarders do.

 

 

If you really want to understand the way in which a caster board such as the  Ripstik works before you make your purchase there are plenty of sites online which will show you just how it works and the way  in which the rider will need to move their body correctly.