Amazon.com: OLFA Compass Circle Cutter (CMP-1) - Adjustable Compass Style Rotary Circle Cutter w/ 6 Blades for Cutting Circles Up to 6 Inches in Diameter, Replacement Blades: OLFA COB-1 Blades, Original Version :
Amazon.com: Olfa Touch Knife Assorted Each [Pack of 12 ] : Tools & Home Improvement