FULL ALPHABET AND NUMBERS printed on blocks that spin; Brilliantly straightforward experience DOUBLE-SIDED; Blocks feature letter/number on one side, illustrated example/word on the other GREAT FOR AGES 2 TO 5 YEARS; Solid wood blocks flip easily for frustration-free exploration; Durable ENCOURAGES LETTER RECOGNITION, number recognition, early reading skills, early math skills MEASURES 12.5 x 9.75 x 4.5 INCHES; Frustration-free packaging