You have a Magictail monofin but you mayby just like to change your tailskin and bikini? No problem :-).. here you can buy just the tailskin (without bikini). The colour is selectable in the white field below. The bikini top size is choosable as well in a white field below. The tailskin size S fit for children between 8 and 10 years. European size: 128-142, US Size 7-11, Austalian Size 24-32.