This is a 50cm Isolation Hoop made from polished aluminium. The qualitry of this hoop is very good for the price. Has 2 very small screws which are flush with the inner edge of the hoop and won't affect performance. This hoop is made from 13mm Thick Tube. Although too small to be used as a traditional hula hoop, this isolation hoop can be used for contact tricks and optical illusions.