2Design with half-square triangle blocks Half-square triangles (HSTs) are among the most versatile design elements in a quilter's tool kit. This easy-to-use set of cards contains an assortment of half-square triangles and solid squares you can use to create an endless number of HST blocks! Discover various blocks and stunning secondary patterns with 100 double-sided cards, 2" x 2", in black, white, light gray, and dark gray. Endless options, unlimited possibilities! Play with value and design using black, white, dark and light gray blocks Endless design combinations with HSTs and solid squares Great activity for groups, quilting bees, and guilds