Ideal inexpensive training ball or perfect for leisure. Upper surface made with a blend of virgin grade natural and synthetic rubber (60% synthetic and 40% natural) Laminated with two layers - 1x cotton canvas and 1x polyester viscose Hi-tech latex bladder Hand stitched Size 3 weight: 330gms ( + or - 15gms ) Size 4 weight: 360gms ( + or - 15gms ) Size 5 weight: 400gms ( + or - 15gms )