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.
The Telstar 18, the design for the 2018 World Cup in Russia, is as close to a perfect sphere as you can get. It has subtle pimples and six thermally bonded panels designed to avoid knuckling, which is the characteristic bobbing and weaving movement when a ball is kicked without spin. All 32 teams have been able to play with it since November in preparation for the tournament, which runs from June 14 to July 15. But despite its similarities to the old ball, players have grumbled about the Telstar 18. Compared to the last few World Cup balls, the Telstar 18 is very similar to the ball used for the 2014 World Cup in Brazil. It won’t fly quite as far down the pitch, and will wobble in the air a little differently, but aerodynamic testing suggests it will be more stable in the air overall.
In terms of durability, you can’t really go past Select. The polyurethane cover on the Numero 10 is tough enough to withstand dog bites and general wear and tear, but still feels nice and soft when kicked. Although this ball is a bit more expensive than other replicas, it comes with a two-year warranty for peace of mind when buying. It also retains its bounce very well over the years – perfect for practicing volleys and clearances.
This ball truly lives up to its name as a “glider,” having a stable flight path when shot and a nice feel when passed. The surface is relatively grippy, which is great for goalkeepers looking to practice their catches. Because the ball isn’t as slippery as some other replicas, you can shoot it with a bit more swerve, and dribbling and skill moves are a bit easier.
As per the kids who can use this ball, it is designed for users who’re 3+ years of age. Children can play with this ball, and when it is quite soft, they can learn the art of blocking as well as heading a soccer ball without hurting themselves. Finally, it comes in 4 different colours as in addition to Blue/Black, customers can purchase it in Orange/Black, Yellow/Black, and Orange/Blue colour combination.

I read a few bad reviews on here but I didn't think the ball will be that bad. I had this ball for just a week! It looked great in the box but it's a very low quality soccer ball. It got deflated after hitting the post. There were marks and slits left on it after everything it hit. Might be good for kids but if you play soccer on a high level, you're really wasting your money buying this.
If you’re working on headers, then your forehead won’t feel like it is being repetitively hit with a meat tenderizer thanks to the design of this ball. That soft touch also translates to a reasonably authentic movement when working on crosses or shots. There is a reasonable bend that allows players to wrap a leading ball around a defensive line, curve a shot around a wall, or work on accurate passing. Control skills off of the chest or knee feel close to authentic as well.
These soccer balls are exact replicas of the finale game balls, right on down to the specific design details that can be found on the ball. If you’re looking for a durable, reliable ball that can help players replicated the feeling of playing the game at home, then the Top Training Series by Adidas is one of the best options to consider today. Each ball is guaranteed to pass FIFA tests for weight, circumference, rebound, and water absorption. It is the closest you can get in the entry-level categories for a soccer ball to the match ball experience. https://www.youtube.com/watch?v=3OKagE2ZIRA
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