Bola Sepak Machine Stitched Football Basic F100 Training Size 4 White

8619247 8789906 8789908 8789910 We #39;ve designed this F100 ball for footballers discovering football with a club or who play occasionally. Need a ball for your football club? With this F100 ball, go for a durable outer material that #39;s ideal for your footballers #39; first steps in football. Durability TPU outer cover for good durability. Lasting air retention Optimised bladder for good air retention. Bounce The ball meets international football standards in terms of bounce. The story behind this ball Its important that young footballers use a ball that #39;s the right size, no matter their age, which is why our design teams have developed the F100. Size 4 between 9 and 12 years. Size 5 for over 12 year olds. In addition, we have conducted numerous lab and field tests to guarantee the ball #39;s ability to withstand every hit. Too light? Too heavy? The weight is standardised... Between 410 and 450 g (Size 5)Between 350 and 390 g (Size 4) How big is it? What #39;s the circumference? Between 68 and 70 cm (Size 5).Between 63.5 and 66 cm (Size 4). A round ball? Average measured variation: maximum of 1.8%. We measure the football #39;s sphericity at 4500 different points and then examine any differences. If the discrepancy is greater than 1.8 % (FIFA Basic Standard), our engineers are tasked with improving the sphericity to ensure a consistent bounce. Maximum pressure loss test: here #39;s what we do... We inflate the ball to the recommended pressure (meaning 0.8 bar). 72 hours later, the ball must not lose more than 15% of its pressure, meaning approx. 0.1 bar. The pressure after 72 hours must, therefore, be at approx. 0.7 bar. This also means that it is quite normal for a ball to lose pressure after a few days. Product Composition Bladder 70% Dry Natural Rubber, 20% Latex Styrene Butadiene Rubber, 10% Polyester Main part 70% Ethylene Vinyl Acetate, 30% Thermoplastic Polyurethane STOCK ADVICE After use, store your ball in a dry and ventilated place.