I acquired my Singing Rock on eBay from Richard Ziarnowski in 2016.
The Singing Rock is forged from aluminum alloy and then soft anodized. Mine is 143 mm. tall, 131 mm. wide, and 16 mm. thick. The rope hole is 50 mm. high and 49 mm. wide. The top center thickness is 13 mm. The shaft length and width are 46 mm. and 25 mm., respectively. The auxiliary hole is 27.5 mm. high and 10.7 mm. wide. The eye measures 26 mm. by 25 mm. The ears are 27.9 mm. long. My Singing Rock weighs 154 g.
One side is printed with "40 kN," "Singing Rock," and 1215."
The Singing Rock is a typical example of a forged aluminum rescue eight.
This eight has a belay slot. The slot dimensions are designed for Sticht-type belaying with 9 mm. rope, and compare favorably with the slot dimensions found in true 9 mm. Sticht-type belayers, but I would have preferred a slot sized for 11 mm. rope since I consider 9 mm. to be a bit small for single-rope belaying.