Many digital pens aren’t equipped with anti-roll caps for some reason, which is a nuisance for designers. The TWINER is a solution to this problem. This small pen attachment is made of plastic, metal wire and silica gel. The plastic is used for the main body, and the metal wire covered with silica gel for the twine that helps the attachment wrap around the pen securely. Twist the twine around any pen of any shape and the pen will stop rolling away during the work process.