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This is a softball size rhombicosidodecahedron model (a bit under 4.5 inches in diameter). The struts are approximately 3 mm in diameter. Even though the design constraints allow for smaller structural elements, a significantly smaller strut diameter would compromise product quality. The item is surprisingly strong in real life. It survived 2 hours being swatted around the apartment by my 2 year old son until sustaining damage (www.youtube.com/watch?v=aTTxXXytThc)