This 25 count bag of "Hippo" glass marbles were made by Vacor for Mega Marbles and come with 24 Player marbles that measure 16mm or 5/8th inches and 1 Shooter marble that measures 25mm or 1 inch in diameter. As an added bonus, they come with 2 free plastic, display rings. Made between 2006 and 2010 they are now retired and have become very collectible and hard to find. The base is a lovely shade of dark blue glass covered with graceful white swirls. Great for playing marble games or using with Marble Runs.