Sargent Art 12-Count Graytone Square Chalk Pastels are perfect for landscape and portrait artists and at home or in the classroom. Square chalk pastels offer a velvety smooth dry texture with brilliant pigmentation ideal for everyone from beginners to experienced artists. Available in a peggable plastic clam shell package excellent for travel and convenience. Chalk stick size: 2.5-inch by.375-inch. AP Certified. Details: 12-Count gray square Velvety smooth dry texture with brilliant pigmentation Available in a peggable plastic clam shell package excellent for travel and convenience Chalk stick size: 2.5-inch by.375-inch AP Certified.