100% Boars hair, wider head, stronger neck + file! The ultimate climbing brush that helps clean holds without polishing or damaging rock, also great for indoor use. The new innovative design is extremely durable while still maintaining enough flex for those hard to reach places. The sleek design also allows for a perfect fit on most existing chalk bags and bouldering buckets. The Lycan is also the first and only climbing brush to have a built-in file for those burly calluses or anything else that might need filing down.