The Manticore Arms X95 Curved Buttpad features an aluminum skeleton structure with an overmolded rubber pad. The rubber pad is curved to conform to the shoulder and not only give better ergonomics and grip but also shortens the overall length of pull on the rifle. By keeping the top edge the same length as the OEM buttpad the rifle does not drop under 26" inches in length, which if shorter than that would make it an NFA Short Barreled Rifle. Note: The Tavor Curved Buttpads and X95 Curved Buttpads ARE NOT interchangeable- each model of IWI Tavor uses its own dedicated buttpad. Please be sure to order the correct buttpad for your rifle.