You will need

Cabled Beret - A
4-6 years - 2 Balls
7-9 years - 2 Balls
10-12 years - 2 Balls
Adult - 2 Balls

Plain Beret - B
4-6 years - 2 Balls
7-9 years - 2 Balls
10-12 years - 2 Balls
Adult - 2 Balls

Ribbed Beret - C
4-6 years -2 Balls
7-9 years - 2 Balls
10-12 years - 2 Balls
Adult - 2 Balls

Tuck Stitch Beret - D
4-6 years -2 Balls
7-9 years - 2 Balls
10-12 years - 2 Balls
Adult - 3 Balls

3.25mm and 4mm Needles
Cable Needle for Cabled Beret