This mini charm glows extra bright with high quality blue glow in the dark pigment. With a quick charge from the sun, or even a light bulb, it will glow for hours. Even walking inside after a few minutes in the sun, it will glow in a lighted room. The cork is sealed with a high grade epoxy, and the contents will never leak or spill, as they are solid resin. Copper Chain with heart clasp is 18 inches long, but I can make it shorter or longer as desired. The glass charm is just under an inch tall from cork to base, and about half an inch in diameter. With care, you should never have any trouble with your charm, but should anything come lose due to poor design or faulty assembly, I will replace your purchase at no charge. *any items shown in pictures that is not mentioned as included are only for displaying items and do not come with purchase. As is the nature of handmade items, they will vary slightly from original picture. Please keep that in mind, as no two items can ever be identical. Please ask any questions you may have prior to purchase. Cheers!