Hello William! That notice means assembly is very much required. These are component bullets for handloading enthusiasts who want to make their own ammunition. In a nutshell, a round of ammunition is made of a bullet, a case, a primer, and a quantity of propellant. This box of 1,000 bullets only contains bullets – not the other components they require to be fired out of a handgun. Please don't order this unless you have a reloading press!