Description Graphic display is a guide only, we do advise ordering a sample before placing your order. HISTORY Our Birnam tartan rug is a beautiful muted earth tones of warm brown and black with pale accents. It is possible to create your own new tartan and register it on The Tartan Register http://www.tartanregister.gov.uk.   ABOUT THE RUG Materials: All of our rugs are 80% British Wool and 20% Nylon. Woven 8 row Axminster with a heavy commercial quality.