Milestone Birthday Cards for ages 1, 2 and 3. Cards are 100% Recycled and are a thick and sturdy 350gsm*. This card includes a recycled Kraft envelope. They come blank inside for your own personal message. Dimensions - A6 Folded (basically a standard sized card & envelope). *What is GSM you ask? This is grams per square metre, a measure of weight for paper! To&FromCards use one of the highest GSM you will find on the market. As our cards are 100% recycled, there may be minor imperfections/flecks seen.