Letters A, O and V are 2.3cm tall by 2.3cm wide.
Letters B, P, R, T and Z are 2.3cm tall by 1.9cm wide.
Letters C, H, K, N and U are 2.3cm tall by 2.0cm wide.
Letter E and F is 2.3cm tall by 1.7cm wide.
Letters D, G, Q, X and Y is 2.33cm tall by 2.0cm wide.
Letter W is 2.3cm tall by 3cm wide.
Letter J is 2.3cm tall by 1.3cm wide.
Letter S is 2.3cm tall by 1.6cm wide.
Letter I is 2.3cm tall by 0.6cm wide.