A traditional Buckeye Burl wood, resembling a tree trunk so realistically that you will feel as if you are sitting in a calm forest rather than a desk at your busy office. A Trimline pen is sectioned off into two pieces for aesthetic pleasure. Fun Fact: Buckeye Burl is a crucial part of the livelihood of a tree. Located at the base of the trunk; if this wood is cut incorrectly, it could lead to the death of the entire tree. Refill Instructions: Firmly grasp both sections and pull. Twist cross style refill counter-clockwise to remove.