A pattern for a top in Sirdar Firefly. Needles: 7mm (UK2, US10.5) Number of 25g balls of Firefly: Chest size 32 inches: 5 balls. Chest size 34 inches: 6 balls. Chest size 36 inches: 6 balls. Chest size 38 inches: 7 balls. Chest size 40 inches: 7 balls. Chest size 42 inches: 8 balls. Photograph shade of Firefly: 896