This prop knife was custom-made by the production for use Jamie Lee Curtis as Laurie Strode during filming. The knife is made of metal and features a retractable blade for stabbing effects. The retractable blade has some remains of fake blood in the blade and its tip can be moved back and forth manually. Probaby, dried blood and/or rust has made the spring system inside becoe lazy. In addition, this particular knife can be screenmatched as stabbed on Michael Myers body, confirming its use during filming. Measures approx. 13" in length.