| http://www.w3.org/ns/prov#value | - The rings may be rigid or any material which effectively retains its substantially annular shape, preferably non-elastomeric material, including plastic, such as polyimide or polyethylene, or metal, such as platinum, gold, stainless steel or Nitinol, and may be 0.25-0.5 mm in length and the ID of the ring is to match the desired OD of the upper portion of the cone portion.
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