what is official soccer ball size

{"cid":"91223106","title":"Custom Logo PVC Machine Sewn Training Soccer Ball Size 5 Official Football with Design","imgUrl":"https:\/\/img.chinax.com\/nimg\/b2\/81\/6a6f41c01519f71378d398abf3f7-200x200-1.jpg","attrs":{"Price":"$1.95\/pieces 500-999 pieces","Brand Name":"HV","Model Number":"HV-FB2","Minimum Order Quantity":"500 pieces","Place of Origin":"Hebei, China","Product Name":"machine sewing football","Color":"blue,green,red,yellow","Size":"5","Logo":"Customer's Logo","Usage":"Football Traning","Packing":"Carton","Type":"Football Training Products","Sample":"Availabe","Sample Time":"7 Days","Packaging Details":"professional size 5 pu machine sewn soccer ball football\r
1. carton+wooden box.\r
2. Customer's requirement is welcome.","Port":"Tianjin","Supply Ability":"300 Ton\/Tons per Month"}}

{"cid":"91174142","title":"Competition Game Table Accessories High Elasticity Football Table Balls For Official Match","imgUrl":"https:\/\/img.chinax.com\/nimg\/a8\/fe\/112bf8637c7a71394ac6e1e378ba-200x200-1.jpg","attrs":{"Price":"US$1-500 \/ unit, negotiable","Brand Name":"PLUSONE","Model Number":"FY015","Minimum Order Quantity":"Negotiable, According to your needs.","Delivery Time":"Lead time 30 days","Place of Origin":"CHINA","Payment Terms":"LC \/ TT","Supply Ability":"10000 PCS \/ month","Packaging Details":"6 PCS or 4 PCS per blister pack, 20 blister packs per carton box","Certification":"CE, RHOS, EN71-1,2,3, Safety, ECO-FRIENDLY","Product nale":"Competition football","Usage":"For football table competition","Size":"36mm","Material":"Composite material","Function":"Featuring high elasticity, high wearing quality","Color":"Acording to customer's requirement","Certificate":"EN71, 6 P, Eco-friendly material","Promise":"We accept small order or several items in a container together with your other finished products. If you want to know more details of our products please feel free to contact us! Welcome to visit our factory to check our production capacity and more about"}}

{"cid":"91199623","title":"Basketball Official Size 7 Light Up Streetball Fluorescent Bright Basketball Ball for Night Game","imgUrl":"https:\/\/img.chinax.com\/nimg\/25\/09\/0215daf305db6bb234846b367533-200x200-1.jpg","attrs":{"Price":"US $29\/ piece","Brand Name":"OEM","Model Number":"OEM","Minimum Order Quantity":"2 pieces","Delivery Time":"3-5 days","Certification":"CE","Place of Origin":"China Mainland","Payment Terms":"T\/T, L\/C, Paypal, Payoneer","Supply Ability":"1000 \/Pieces per Day","Packaging Details":"Standard Export Carton","Application":"Night Game","Material":"PU","Type":"Night Light"}}