Requires
11, 12, 13, 14, 15 x 50g balls of main colour
11, 11, 12, 13, 13 x 50g balls of 1st contrast colour
4, 4, 4, 5, 5 x 50g balls of 2nd contrast colour
3, 3, 4, 4, 4 x 50g balls of 3rd contrast colour