The Roll & Go Hair Tool is a double-sided round comb and can be used to create many hairstyles! The teeth of the comb are 7cm long. The diameter across of the larger end of the tool is 3cm for larger rolls. The diameter across of the smaller end of the tool is 2cm for smaller rolls. The Roll & Go Hair Tool makes wrapping hair into uniform, round tube shapes like Victory rolls a snap! You can also use it to make large pin curls, cool round shapes for contemporary styles, and much more! Patent Pending. The Roll & Go Hair Tool Box Includes 1 hair tool and a 32 page instructional booklet detailing how to use your hair tool for many different wonderful hairstyle looks.