adidas Tango Rosario Ball Based on the design of the football used in the world's premier international tournament in Argentina in 1978, the Tango Rosario is iconic. Hand stitched for durability and a true touch, this FIFA-quality training ball has a butyl bladder and a polyurethane surface. Hand stitched for high durability and a good touch Material Content: Polyurethane 100 % Butyl bladder for best air retention FIFA Quality certified: Ball passed FIFA tests on circumference weight, rebound and water absorption Training ball Requires inflation 100% polyurethane cover