Carved into its face are letters in early Irish script, partially worn away at the edges, reading something close to RGUSSAN AIT DO. The back of the stone is completely blank. It is easy to overlook, and that is precisely what makes it worth attention.

The site itself, St. Berrihert's Kyle, is an early medieval ecclesiastical enclosure, a defined sacred precinct associated with a local saint. The oval stone enclosure in which the slab now sits was built by the Office of Public Works in 1946, giving a certain layered quality to the place: ancient material rehoused in mid-twentieth-century stonework. The inscription was studied by Ó hÉailidhe, who in 1967 proposed reading the fragmentary text as a prayer for a person named Fergussán, a plausible early Irish personal name. Notable in the lettering is the use of ligature, where certain letters are joined together in a single combined form, a scribal technique more often associated with manuscripts than with carved stone. The slab measures just 0.28 metres by 0.25 metres, with a thickness of 0.08 metres. Later scholarship has complicated the picture somewhat: Okasha and Forsyth, writing in 2001, suggested that the second line of the inscription may not belong to the original carving at all, but could be a later addition, meaning the stone may carry two separate moments of inscription, from two different hands or two different centuries.