Sets include 200 letters, numbers, symbols, and punctuation. Contains small parts. Made for ages 3 and up. Details • dimensions: 1" max height, widths vary • materials: eva foam, rubber sheet magnets • character count: 200 uppercase letters, numbers, symbols, and punctuation • packaged in a sturdy, resealable bag Please note Choking hazard. This product contains small parts. Keep away from children under 3 years old. Adult supervision is recommended. These magnets will not work on glass magnet boards. These letters are made of a soft foam material and therefore are not impervious to imperfections, such as dents, or warping. However, these imperfections can usually be worked out with your fingers or a little low heat and easily reshaped on a magnetic surface.