Universal racks In polypropylene, autoclavable.They can be used either dry or in water bath; the particular design permits an optimum fluids circulation to assure that all test tubes reach the same temperature. They can be frozen without any risk of distortion. They have an upper embossed alphanumeric grid to facilitate samples identification. They can be easily assembled and stacked when empty. Available in: white (03), blue (04), yellow (06) and red (10) colors.