McGills Warehouse has a wide range and variety of gems and marbles available for purchase including set of these ten clear handmade marbles that have a unique pattern of light blue and red colored swirls. These 16mm inch sized marbles are made using the best quality of glass for the absolute best experience. They have economical prices so that if you need more then you can purchase them in bulk without any issues or spending too much money. Residents of United States and people that buy their products in large quantities will also get free shipping which is a great benefit when shopping from them.