These tactile cards (the size of playing cards) have a great sandpaper feel! Plus...this is a multi-pack that contains 3 sets of cards: Upper Case, Lower Case and Numbers, so it will meet many of your needs for use with individuals of varying abilities. The letters and numbers are a very dark blue and set against a white background for a great visual contrast. The baselines on the cards use the same lines and spacing as many of our writing and letter papers. The textured raised lines are 1/8" wide which is the perfect size for one or two fingers to trace. Arrows on the cards show the correct direction of how each letter and number is formed. The raised dot in the lower left corner indicates the correct orientation of the card. All cards are stored neatly in a transparent plastic case.