Pocket Flash Cards Sign Language by Trend Educational Products. $5.22. 56-PK 3X5 TWO-SIDED CARDS. * Children demonstrate basic signs on 26 illustrated cards, plus the photographic manual alphabet on 26 cards. Includes 4 information/activity cards. Ideal for home, school, or travel. 56 two-sided cards per set, with quick-sorting rounded corners. Handy 3 1/8" x 5 1/4" size.