The pattern calls for 8 (S), 8 (M), 9 (L), 9 (XL), 10 (XXL),11 (XXXL) balls of Sumatra, and 3 (S), 3 (M), 3 (L) 4 (XL), 4 (XXL) and 4 (XXXL) balls of Plum. Knitted with one strand of Sumatra and one strand of Plum held together.