N-Force is a series of Nerf foam weapons that was released in 2009 to 2011. Until now, I still think that no any NERF foam weapons can surpass the N- Force series! :
Amazon.com: NERF Hacha de brujo N-Force : Juguetes y Juegos
Amazon.com: Nerf Espada N-Force - Shadow Fury Blue : Juguetes y Juegos
N-Force | Nerf Wiki | Fandom
n force – Foam From Above
Brand New Old Stock 2010 NERF Nerf N-Force N Force VANTAGE Sword RARE | eBay