Just in case anyone's wondering, I highly doubt the big (3*3*60) box is pucks. Rubber is far too heavy and foam is too light (when calculated using -
http://www.ebay.com/itm/POOF-Slinky-...-/331413584959 as the approximate foam weight, the box would only weigh around two pounds).
Perhaps it is a mix of rubber, foam and street hockey pucks and tennis balls.