Our Helter Skelter marbles are beautifully Hand crafted art glass. These delicate marbles measure 16mm and are beautiful to behold. They are intricately designed and crafted in abstract swirls of multiple colors ... all encased in crystal clear glass shells. This is a beautiful marble set that will be a great addition to any collection. Set includes all 3 of the Helter Skelter patterns. Hand crafted marbles will exhibit a “pontil” mark where the marble was attached to the “punt” during the creative process. Each hand made marble may display a "punt" or "pontil" mark that indicates it is an individually crafted art glass marble blown freehand. This small mark is an indication of the individually crafted art glass manufacturing process, it is not a flaw or damage. Because each one is handmade, no two marbles of a given pattern will be exactly the same. Lifetime Warranty Certificate included