The motifs are still there, sitting on the nearly flat upper surface of a large earthfast boulder, meaning one embedded in and supported by the ground rather than resting freely on it. The stone measures roughly 3.4 metres east to west and sits at around 156 metres above sea level, with a mountain stream running about ten metres to the south-west. What makes it quietly arresting is not just the carving but its incompleteness: one of the motifs, a cup-mark surrounded by four concentric rings, appears to have lost its southern half, possibly to the slow violence of freeze-thaw action over many centuries. A faint arc suggests a fifth ring may once have been attempted, or begun.

The carved forms belong to a tradition known as cup-and-ring rock art, a type of prehistoric mark-making found widely across Atlantic Europe and most commonly associated with the Neolithic and Bronze Age periods, roughly four to five thousand years ago. The technique involves pecking or grinding into stone to produce a central depression, the cup, encircled by one or more carved rings, sometimes with a radial groove cutting outward through them. At Coomlettra, two main motifs sit close together on the triangular decorated surface of the boulder. The northernmost is a cup-and-three-ring motif with a radial groove extending nearly 38 centimetres from the central cup before running into a natural fracture in the rock. About 37 centimetres to the south sits the four-ring motif, its surviving rings running east, south, and west. To the east of these, a distinct cluster of small, well-defined pickmarks occupies a separate area of the stone's surface. About 15 metres to the south-south-east, a stone wall encloses two roofless buildings, a reminder that this landscape has been used and passed through across many different periods. The site was identified in 1998 by Paddy O'Sullivan, a Teagasc agricultural adviser, making it a relatively recent addition to the known record of Kerry rock art.