Design 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