Cavallo 181X Rug in Grey. Machine Woven, Heatset Polypropylene, Pile height (mm): 8mm. Introduced in 2018 by Oriental Weavers, in shades of greys and neutrals the Cavallo range is super sleak, minimal, and modern. Machine woven with a cut and loop pile the Cavallo rugs have a soft touch. These are rugs suitable for both indoor and outdoor.