100% cotton from Northcott. Itsy Bitsy Project Panel is a yard panel of nine 12" by 14 1/2" blocks. Largest letters are 3/8" tall. Test tubes are 1" tall and chemical blocks are 9/16" square. Stripes are 1/16" wide. Although designed for small projects this would also make a great quilt. The picture shown is the entire one yard panel. Crayola Colors are Orange and Robin's Egg Blue.