Unho Blunt BALISONG Butterfly Trainer Knife Stainless Steel Practice Metal Training Dull Kit Dragon Sheath This is designed for practicing butterfly knife, it is with blunt steel blade. Especially it is with pretty cool dragon pattern Material : Stainless steel. Hardness: 56HRC.The handle is made of die-cast zinc steel, integrated molding Length (when opened): 23.2cm(9.13"),Blunt steel blade length : Approximate 8.5cmBlade (dull) Length: 9.8cm(3.85"),Thickness: 0.3cm(0.11"),Width: 1.8cm(0.70") Steel type : 440C