Additional labels to be used with your PenFriend Voice Labeling System for the Blind. Pack C contains 418 labels: 364 x circles, 13mm (approx. 1/2") (4 sheets), 54 x squares, 32mm (approx. 1-1/4") (3 sheets) Please note: due to the unique codes embedded in the labels, only one set of each label pack can be used with each PenFriend. Please purchase the packs in order: Pack A, followed by Pack B, then Packs C, D, E and F.