Set of 52, 26 upper case and 26 Lower case letters. Made from see through pale blue plastic to provide confidence when placing letters into position. Reverse side of each stamp shows appropriate letter, difference between upper and lower case, directional arrow and a central line to assist with positioning. Approx. height - lower case: 1.25"(30mm) / upper case: 0.5" (12mm). Comes in storage box for safe keeping and compact storage. Made from high quality food grade plastic. Shatterproof.