Audio-wise I have yet to find out, but well built cable. Good value for money. If you want the best audio transfer, pundits say you should use electrical co-axial because the optical signal from the CD/DVD/Blu-Ray has been converted into electrical digitial then back into optical digital for transfer. using an electrical co-axial digital cables cuts out the last conversion in this chain, so should reduce the risk of errors. That having been said, if you DO need to use an optical cable this is probably as good as it gets unless you want to spend stupid money.