Numbers(1,2,3,4,5,6,7,8,9,10,21) Correlate to which number of the set the singles are and what's written on the box NOT THE QUANTITY! If you'd like sets there are 7 options for sets which include numbered pieces that are included within each set. Each set will include the numbers in parentheses and the number stated before the parentheses is how many are included in the set [EXAMPLE:Set Of 8(1,2,3,4,5,6,7,21)] Meaning 8 pieces are included in the set and the numbers are which singles are included in the set or you can buy multiple singles. Please Look Through All Pictures Of Sets and Singles so You know what you're buying. Each set or single excludes certain items and are made specific on what's in stock. Message me for details if you have any questions.