These heavy-duty scooters feature dual-rib construction and have hand protectors (handles). Available in two sizes: 12" or 16". Sold in a set of 6 consisting of 1 each of the following colors: red, orange, yellow, green, blue and purple. These scooter boards can be used with 3 different types of wheels! TRADITIONAL Our HD (Heavy-Duty) Traditional Scooters boast solid 2" diameter rubber wheels for a smooth ride and dual rib construction for durability. ALL-TERRAIN Take your scooter board activities to a new level with our HD All-Terrain Scooters featuring large 4" diameter polyurethane casters with ball bearings and dual rib construction for use on just about any terrain be it asphalt, concrete or a gym floor. FAST ACTION Our HD Fast Action Scooters are modeled after in-line skate wheels. Their 4" diameter and non-marring material are suitable for use on any surface, even carpet. These scooters sit higher off the floor making them easier for older children and adapted P.E.