For Ages 6 Years And Up WARNING: Choking Hazard. Small Parts. Not Suitable for Children Under 3 Years. A stunning set - The smallest planet marbles we have! Miniature accurately represented Earth Globe in translucent Blue Glass and the Moon and Mars in opaque glass. Geographically accurate for the 3 planets - they measure only 15mm in diameter and are a wonderful curiousity to have such detail in something so small. These marbles measure approximately 15mm (0.5") diameter, Mars Marble is slightly smaller than the Earth and Moon. Supplied in gift bag with display stands. A stunning design ideal for a gift, gameplay, party bags or solitaire.