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! :
Nerf - N-Force Marauder long sword red | Facebook
NERF Vantage N-Force Toy Sword - 32" Long - Foam Blade with Plastic Core - for [...]
SG Nerf: Nerf N-Force Vendetta - Review!
Nerf N-Force Marauder Long Sword - Entertainment Earth
NERF NFORCE swords | I love these! | Aranami | Flickr