Parallel Lines with Ease - Quickly and consistently draw parallel lines for various projects including illustrations construction details mechanical drawings technical sketches even calligraphy. Durable Acrylic - The crystal clear acrylic is designed for toughness and precision and comes with under inking. Smooth Gliding Action - Move and use with ease with the aluminum and rubber rollers. You can continue using this without lifting it your drawing surface. Multipurpose Tool - Because of the all-in-one design and function this can transform to anything you need for your drawings and drafts. A Professionals Choice - 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. Proudly Made in Poland