The BG-AK is made of the same durable material as TangoDown'sA(R) entire BATTLEGRIPA(R) line and offers similar TD Inc. signature features: comfortable ergonomic design; aggressive non-slip texture; and patented internal storage for essential spare parts or optic batteries. TangodownA(R) designed the grip off of it's BG-16 AR-15 grip. Notes: TangoDownA(R) and BATTLEGRIPA(R) are registered trademarks of TangoDown, Inc.