"Red Rings" are made of painted steel rings 2.5 meters in diameter. Note far right, bicycle on Eastlink Trail, west of Toll road, Mt Waverley. Melways ref p 72 C9.
It is not easy to find at 105 Barreenong Road, down a gravel track labelled Fire Access Only. This "road" is off the Strathewan / Arthurs Creek, Whittlesea Road is off the Kinglake - Heidelberg road. See www.whereis.com and maps.google.com.au