{HEAD ~ A silicone rubber} or a thermoplastic elastomer in {TAIL ~ liquid form} may then be injected through a funnel associated with mould half B so as to form via casting the internal flexible membrane 
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{ HEAD ~ A silicone rubber } or a thermoplastic elastomer in { TAIL ~ liquid form } may then be injected through a funnel associated with mould half B so as to form via casting the internal flexible membrane
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH