3D Printed Product Disclaimer This item is created using 3D printing technology. Because of the printing process, slight surface variations, layer lines, or minor imperfections may be present. These are normal and part of the unique character of 3D printed products, not defects. Please avoid exposing this item to extreme heat or leaving it in hot environments (such as inside a vehicle), as high temperatures may cause the material to soften or warp. Licensed design by Smoggy3D Focal contains 3.8mm hole all the way through, Topper contains 2mm hole half way that screws onto pen top.