Most descriptions list the series for ages 5–9, though at least one volume is noted for ages 4–8.
They are classified as juvenile (children's) fiction in the comics & graphic novels subgenre with a fantasy theme.
Four young horses from rival herds must join forces to fulfill a prophecy about a magically gifted yearling and to protect magic in the realm of Horsa.
Heights are about 9.0–9.2 inches and widths about 6.0–6.3 inches; single-volume thickness is roughly 0.5–0.7 inches, while the collected paperback lists about 1.5 inches depth.
Later descriptions mention a hidden world that includes Ice Horses, Gem Horses, and moving mountains.
