Using these unfinished wood tulip - shaped flower crafts is easy. First, peel off the protective paper backing that comes on most of the crafts. This was there to keep the wood safe during cutting and shipping. If you need a hole in the craft, tell the seller the size and where you want it. You can use these crafts for up to 46 different DIY projects. They come in sizes from 3 inches to 36 inches and are made of cabinet - grade Baltic birch plywood in thicknesses of 1/8 (3mm), 1/4 (6mm), or 1/2 (12mm). If you need a different thickness, just ask the seller. As for maintenance, keep the wood in a dry place to prevent warping or damage. When you're done with your project, you can display your creation proudly knowing it was hand - made with care in the Pittsburgh suburbs.