Select Numero 10 Soccer Ball Hand-stitched for tighter and stronger seams, "Shiny" polyurethane cover is 1.5 mm for great touch Extremely popular and hard-wearing quality ball for all playing conditions IMS(Size 5), NCAA, and NFHS Approved. Made with FPUS 1500 synthetic leather The size 4 model is the same quality and construction as the size 5 model but does not come with the IMS or NFHS stamp 2 year guarantee