The Hobby Superknife accepts standard #11 exacto blades. This new tool folds down to 2 1/4 inches for easy portability and measures 3 3/4 inches when locked open. To replace the blade, just remove the phillips screw located in the blade holder, remove and exchange the blade, and replace the phillips set screw. With the Hobby Superknife, you will never have to worry about loosing another knife cap again. The Hobby Superknife is available in Silver, Black, Blue, Red, and Purple.