Located a little distance below, and to the north of, Y Gamriw's summit cairn, this pair crown a NE-SE aligned ridge, complementing the sentinel monument nicely. In my opinion. There are fine views toward the stone circle (and whatever else may be there!) located in the vicinity of Crugian Bach, not to mention further afield across Y Elenydd.
According to Coflein the north-eastern (Coflein II) is
"A much disturbed cairn, 14.9m by 16.7m and 1.8m high."
The south-western (Coflein III) is "A tumbled and ill-defined cairn, 15.2m in diameter and 1.5-2.4m high, a large central crater is occupied by rough stone shelters."