Ursa Grizzly Mammoth Ivory Pocket KnifePrehistoric woolly mammoth ivory and 9CR12MOV steel Grizzly by Ursa Knives pocket knife is a beast of a knife! Featuring a big, ridged double sided mammoth tusk handle, sturdy blade, and clip on one side. 8. 25" in length open. Fossil mammoth ivory is found in the cold northern regions of Alaska, Canada, Russia, and Siberia and may range in age from 10,000 to 200,000 years. Natural colors are found in creams and tans and, rarely, deep chocolate