These peel and stick dry erase wall decals are great for any home or office. Works on a variety of flat smooth interior surfaces including walls, stainless steel, glass, and more. Easy to remove, won't harm most surfaces. Great for universities, health care companies, financial institutions, and much more. 8 1/2" x 11" Phthalate Free removable vinyl with a dry erase surface. Optional non-imprinted dry erase black ink marker, plus an adhesive clip available for an additional cost. Due to the variety of surfaces and dry erase pens available on the market, dry erase skin sample for testing purposes, if you plan on using your own marker.