Using these unfinished wood ghost shapes for your Halloween crafts is a breeze. First, if you want a hole in the shape, let the seller know the size and location. When your craft arrives, peel off the protective paper backing. You can then paint, stain, or decorate the wood as you like. Since it's unfinished, you have the freedom to make it your own. As for sizes, you can choose from 1' to 24' to fit your project needs. The plywood comes in 1/8 (3mm), 1/4 (6mm), or 1/2 (12mm) inch thicknesses. If you need a different thickness, just message the seller. For maintenance, keep the wood in a dry place to prevent warping. Avoid exposing it to excessive moisture. And if you want to preserve your finished craft, you can apply a clear coat to protect the surface and make it last longer.