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