Dumas EC-12 Rudders

If anyone out there owns a Dumas East-Coast 12 Meter, and needs a Rudder for it… . Dumas still has the moulds.

Keep in mind that Dumas boats are long-since obsolete given the new class standards in terms of competition, but, there is absolutley, positively nothing wrong with them in terms of club-racing.
Also, Keep in mind that this rudder mould will work ONLY for DUMAS branded EC-12s

Am I correct in thinking that those castings are just poured resin or do they have some type of fibre mixed with the resin for reinforcement?
If thy’re just resin castings are there any issues regarding brittleness?