These letters are printed on heavy, durable paperboard with a fine sandpaper surface that is extremely well bonded to the card so that it will not rub off over time. Each figures features directional arrows to help ensure proper formation of the letter. Aside from the normal 26 letters of the alphabet, this set also includes two additional cards for alternate forms of l and t.  The 28 each cards measure 11 cm x 7 cm (about 4 1/4" x 2 3/4") and come in a handy storage box.