Umedisc is a Hong Kong company.
It is RICOHJPN D01, not R03 (which would be 16x DVD+R SL).
It could be DL media with faked media codes.
The Ricoh DL media code has also been abused for Playo DVD+R DL (Made in China), which could have originated from the same source.
I don't know what they burn like. Usually LGs should burn genuine Ricoh DL well. But as this is fake media, be prepared for the worst (coaster rate 50%+).