They were advertised as MP Red Speed burrs which I bought for a Mazzer grinder and at the time, this was a couple of years ago, I wrongly assumed that meant SSP. But they turned up unbranded.
It was my fault really but I didn’t realise red speed was just a coating used by other manufacturers at that point.
La Marzocco Linea Mini - Mazzer Philos
Ikawa Roaster