This set of five American marbles has been selected to include varied colours, styles, seams and glass types across a range of vintage and later makers; providing a fun and informative opportunity for enthusiasts to identify different across the many producers of this type of marble. These might include Heaton, Alley Agate, Jabo and Ravenswood, among several other vintage and later companies - because the production process was often similiar, these types provide an intriguing challenge to differentiate them. The bright colours and appealing patterns make them very collectible.