ALVIN Introductory Bow Compass Model 201 Ideal for Geometry Drafting and Engineering Drawing and Architecture Tool - 6" Inches Description Features: Features smooth center wheel adjustment creates circles 1/8" inch to 12" inch in diameter Premium Quality - Made in Germany from matte silver zinc and durable fiberglass, and comes with a manufacturers warranty. Ideal for Students - Perfectly useful for all levels, whether for geometry class, drafting, architectural design, construction, or engineering. Conveniently Packaged - Comes in a hard, see-through plastic case for portability and easy storage and transport. ALVIN has been the professional's choice for drafting tools and drawing supplies for over half a century. Since 1950, we have been known for our wide selection of high-quality products at a fair price Product Details: Brand: ALVIN Material: Fiberglass Item Weight: 2.5 Ounces Product Dimensions: 6"L x 6"W Manufacturer: ‎Alvin Brand: ‎ALVIN Item Weight: ‎2.5 ounces Product Dimensions: ‎7 x 0.75 x 3 inches Item model number: ‎201 Is Discontinued By Manufacturer: ‎No Color: ‎Clear Material Type: ‎Fiberglass Number of Items: ‎1 Size: ‎6"" Manufacturer Part Number: ‎201 Date First Available: December 14, 2006