Just wanted to write a review to clarify a couple of points about this kit. Firstly, I don't know whether they have changed the contents, or whether other reviewers were mistaken, but the ball I received was definitely 65cm (I measured it). I agree with other reviewers about the lack of a valve in the opening making it difficult to blow up fully and meaning some air is lost when removing the pump and putting in the stopper, but I did manage to get it to a good-enough level of inflation without too much trouble, and it has now been inflated for several days and doesn't appear to have lost any air. One final point I wanted to make was that for some reason, I assumed that the tension band in the picture was a yoga mat, and therefore was disappointed not to receive one. I realise this was my own mistake as it is not implied in the information in the advert, but wanted to mention it in case others made the same mistake.