The phonograms are available in printed versions. They are provided in 16 double letter combinations: er, ee, ar, ou, oo,ai, or, ue, ie, au, oa, sh, ch, oy, th, qu. they are printed on sandpaper of different colours like green, blue and pink and they are put in a box. They are used to teach children phonetic sounds. They are made using non toxic materials that are child safe. They are easy to carry around and light in weight. They are equipped to handle rough use and they are long lasting.