Practice Metal Butterfly Balisong Knife Trainer Gloss Gray Filipino Batangas Kali Escrima Arnis All Metal Construction with Real Weight and Size! Safety Metal Blade is Dull and Rounded! Legal Blade is Perforated, Dull and Cannot Be Sharpened! 5" Closed, 4" Blade A must item for anyone learning the Balisong or Butterfly knife!