Nivia Yellow Cricket Tennis Ball Extra Heavy Weight 145Grams +/ - 5 Grams(Pack Of 6 Balls) Nivia yellow Cricket Tennis Ball Extra Heavy Weight 145Grams +/ - 5 Grams(Pack Of 6 Balls) Solid Innner Core Perfectly round shaped with Heavy Weight These Nivia Balls are heavy so they facilitate greater performance. Made by Nivia under an exclusive arrangement.