A cylindrical cutter that can be gripped like a pen for ease of use. Its shape makes it easy to hold and use for long periods of time without discomfort. It has an industry-leading diameter of just 10 mm making it both highly portable and easy to store in a bag or pencil case. For additional safety, this cutter also has an auto-locking function whereby the blade can only be extended when a button is held. The rear of the product features a clip as well as a tool to remove used portions of the blade.