Sargent Art 12-Count Grey Tone 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.