Model PB410 pneumatic box carriers are designed for Bavis Autoveyor and Trans Trax operating systems. They are very sturdy, constructed of one sheet of plastic. A durable hinge makes it easy to open and ensures long life. Box color choices are: clear, red, blue, yellow and green. Size: 1-3/4 inches H x 4-1/2 inches W x 10-1/4 inches L. One free set of labels is available if specified when ordering. This includes two long vinyl strips of the same color.