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They are made of SBS rubber. According to user "B. Lister" on eurobricks.com, these bands are silicon rubber, used in medical and dental work for long lasting connections and tension. Source However, a LEGO representative at a toy safety site indicated otherwise: The colors and materials in ABS plastic do not rub off or leach and, in fact, meet the ...


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I cannot be certain about this, but I think it could be one of these two material options, (1) Urethane: i.e. it's not rubber at all, and it is moulded, and not extruded. That's probably also why they have colour options. (2) Butyl rubber: this is the rubber used in tyre tubes. I've used cut sections from inner bicycle tubes, and they stretch and seem to ...



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