The Addaday Fly Roller has two density gears that can give a deep massage. The Fly Roller Surface Skin Technology can be used with one hand or two depending on the amount of pressure you are looking for in your massage. You can use one gear to have a more focused massage on a certain muscle or you can use both gears. The Red gear the (SST gear) is the softest of the two.
The Fly is 8" long and 3" high