Two sizes of dispensers are available. One holds a box of 12 x 75mm test tubes and the other holds 16 x 150mm test tubes. To load the dispenser, remove the cellophane wrapper from around the box, slide the box into the dispenser and set the dispenser upright. A clear acrylic front panel allows the contents to be viewed. A notched opening makes it easy to shake glass fragments from the dispenser while the tubes are in place.