| http://www.w3.org/ns/prov#value | - The coating material is preferably elastic material, such as silicone, polyurethane, or PTFE. If an expandable area at least partially coated with such coating is axially stretched and the stretching force is removed, the expandable area will return to the radially expanded state due to the contracting force applied by the coating on adjacent elements, such as struts.
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