These sterling silver charms are letters in the Greek alphabet. They are about 15 mm tall and 10-13 mm wide. I have all of the Greek letters (Gamma, Delta, Theta, Lamda, Xi, Pi, Sigma, Phi, Psi, Omega), as well as the alphabet block letters that look like our alphabet (Alpha A, Beta B, Epsilon E, Zeta Z, Eta H, Iota I, Kappa K, Mu M, Nu N, Omikron O, Rho P, Tau T, Upsilon Y, and Chi X.