Bio All jars are manufactured using our proprietary custom molds. Unlike other "stash jars" they are not re-packaged, off-the-shelf candle jars. These jars are high quality with thick walls and a custom made seal designed for ease of use, while maintaining an air tight seal. Our printed images are NOT stickers, but are baked on at high temperature and are literally fused to the glass...they will not peel or scrape off, are dishwasher safe. Writable jars allow you to write on it with a Sharpie and erase it with soap and water as often as you like!