Peter Baldwin

Delrin is a Dupont Trademarked engineering thermoplastic (it is a form of Acetal) used in precision parts requiring high stiffness, low friction, and excellent dimensional stability. I don't believe it contains any additional (IOM non-compliant) compounds to provide its strength and wear resistance. see https://www.dupont.com/brands/delrin.html

I think that it was in the post race press conference about the on the water umpires had the necessary GPS enabled tools to decide on whether it was a penalty or not. I would expect both Umpires (I think that there is an Umpire boat typically following each contender) to have communicated and both agreed prior to the "No Penalty" announcement being made.

It is available in the US from several places such as MPI https://www.maxxprod.com/mpi/mpi-15.html Price is $130 plus shipping ($8). You may well get charged import VAT duty and a PO handling fee (£8) that could well total about £30