Made of durable 0.08-inch thick polystyrene. Features a full 360-degree of long-lasting graduations and beveled edges. Center cutout for easy lifting.

Alvin has been the professional's choice for drafting tools and drawing supplies for over half a century. Since 1950, we have brought quality and value to our customers. Our tools help bridge the gap between ideas and innovations We are known for our wide selection of high quality tools at a fair price.