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This 12-oz. ball works for players between 8 and 12 years old and has a circumference of 26 inches, larger than a size 3 and smaller than the size 5. This age group tends to play on a field of about 30 to 50 yards, writes Deborah W. Crisfield in "The Everything Kids' Soccer Book," with a goal size of around 6 feet high and 18 feet long. Again, the scale for the U12s falls between that of the U8s and that of the older age brackets for the No. 4 ball and the game as a whole. Some leagues may limit the No. 4 ball to U10s instead of U12s, so check league rules before making a purchase.
Using a wind tunnel, Goff has researched the flight properties of the Telstar 18, drawing its drag curve to discover where the ball might dip and swerve in the air, similar to the knuckleball free kicks favored by Cristiano Ronaldo “Even if aerodynamically the Telstar 18 isn’t that different from the Brazuca, it’s still going to wobble a little bit differently because the panel shapes are different,” Goff says.
Now you know that there are total 5 variations in ball size. Buy the appropriate size as per your requirement. Some buyers who don’t know these differences, make a mistake while buying. For example, if someone is looking for an official match ball, but they purchase a size 3 ball by mistake or because of lack of knowledge. If you also do this, surely you are not going to be satisfied with the purchase.
This soccer ball will light up anywhere as it is comes with replaceable batteries which makes it better than a glow in the dark ball. Glow in the dark soccer balls cannot operate in any type of lighting as the phosphorescent materials must be in very dark lighting. The fact that the lights are impact activated is an awesome feature too, as it encourages kids to play and focus on the game.
With the increased seam length, Goff says there was actually a risk that this ball would be too rough. “Very little changes in those textures can have noticeable aerodynamic effects,” he says. The fact that the Telstar 18 has almost the same drag curve as the Brazuca, with aerodynamic properties changing at about the same speeds, is impressive. “It has to be an engineering and technical challenge,” he says.