“... a 4-inch razor blade....a 10½-inch meat cleaver...”
A 4-inch what? Could that possibly be a straight razor? Where would a kid in NYC get a straight razor? Where would a kid in NYC get a meat cleaver? Who keeps a meat cleaver around these days except a butcher or restaurant or maybe a hunter?
It is a strip of snap-off boxcutter blades.
http://www.amazon.com/b?ie=UTF8&node=409662
$9.95 and up