Crafters Hotwire Foam Styrofoam Hot Wire Cutter Knife Operated on One Dry C Cell Battery Great for Hobby RC Model or Arts And Crafts Projects One (1) NEW Battery Operated Styrofoam Cutter 4-1/2 Deep 1-1/4 Wide Power by 1 C size dry cell battery, Not Included. Great for art project. Easy to use.