Only size 5, and size 4 are available for this. Although this should not be a major problem as this is for recreational play and practicing purpose, so kids are ok to play with this as well. In fact, the ball that will be given away to the developing countries will be used by the kids mostly. If you are buying this for an adult go for size 5, and if you are buying for kids or youth players then better go for size 4.
However, by selling out so hard in terms of responsiveness, the Mikasa has painted itself into a bit of a corner. Specifically, the synthetic leather casing makes this ball unsuitable for use on any surface outside of natural grass.In fact, even artificial grass will begin to wear down this ball once the glossy finish has been worn away. When you factor in the machine stitching, you end up with one of the least durable soccer balls on our list.
I purchased the soccer ball for my son as a gift. It came deflated so we filled it with air before boxing it. Upon opening it, it was deflated. It only held air for a few hours. I contacted the company and they immediately shipped out a new one without hassle that is holding air just fine. (I was very pleased with how prompt and pleasant they were!) It lights up very bright when hit or bounced and turns off on its own after a little while of not being hit or bounced. My kids all love it and play with it nightly. It is not stitched as a real soccer ball is, but is more of a heat fused soft plastic. It holds up just fine though to my 13 year old soccer player's kicks. We are all enjoying playing with it and happy with our purchase.
Size 5 is the official size for professional matches. Therefore, this ball is only available in this size. Do not use this soccer ball on concreted areas. Its unique rubber uses Puma Airlock Valve Technology (PAL) in order to facilitate proper airlock technology. This ball features Perimeter Balance Technology (PBT) which enables it to maintain impressive flight characteristics. https://www.youtube.com/watch?v=j2Xn84L3Kcs