Q4 Kompetitor Basketball Size 7Regulation size 7. 29. 5" circumference. 22 oz (623 gm). For boy's and men 15 years of age and over. The Q4 Kompetitor rubber hybrid basketball has been specifically designed for outdoor competition play, but performs equally well on indoor surfaces. When you want to play at the highest level, but don't wish to cut up your expensive composite leather basketball, the Kompetitor basketball is your best option. With the durability of rubber, but the