These fit on most paint caps including Vallejo, Army Painter, and Reaper paints. They fit snugly and will hold firm after pressing them on and giving a little twist. ( Am able to lift the bottle by the cap in most cases without it detaching and without a need to glue ). By painting the themed design, it gives you an idea of what your paint looks like in highlight and shadow. What's the difference between PLA and Resin? The resin parts are printed at a much smaller line height which means you usually cant even see the layers and provide a greater level of detail. They also however take extra steps to process after printing which increases the cost. (side by side images coming soon) Vallejo paint cap topper - loose cobblestone remix by LilR is licensed under the Creative Commons - Attribution license. Vallejo paint cap topper by antiping is licensed under the Creative Commons - Attribution license Paint cap crystal by Woblin is licensed under the Creative Commons - Attribution license.