Pebbles A2 Cards & Envelopes. This boxed set of cards is perfect for any card maker or for anyone just looking to send notes to friends and loved ones. Use them as they are or embellish and customize them to your recipient and occasion. Each card features a pretty patterned design on the outside with a blank white inside. They come with plain white envelopes. The cards measure 4-1/4x5-1/2 inches, the envelopes measure 4-7/16x5-11/16 inches. This package contains forty cards (four each of ten designs) and forty envelopes. Design: Birthday Wishes.