This set of 4 tubes can be used with silks, ribbons, currency, coins, balls and just about anything else you can fit inside! Features the quality construction you would expect from Ickle Pickle Products and a nice portable size. Standing on the Aluminum base, the set measures approximately 7 inches tall with the outer tube at about a 2 inch diameter and the smallest inner tube at slightly over 1 inch. (just big enough to hold 1 inch diameter balls!) Once you are familiar with the workings of the apparatus, you'll be able to use your imagination to come up with limitless routines.