{HEAD ~ A silicone rubber} or {TAIL ~ a thermoplastic elastomer} in 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 ~ A silicone rubber } or { TAIL ~ a thermoplastic elastomer } in 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 TAIL 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 OTH OTH OTH