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The upper cylindrical net is made of strong Beaver Nylon with a diameter of ?25 cm and a length of 5 cm. The conical net bag is made of Monodur Nytal (Nylon) and it is 40 cm deep. The bag is available in all mesh sizes.The plankton sample can be gathered by dismounting a chromium plated, brass sample cylinder from the PVC ring located at the bottom of the net. Content 35 ml. The sample can be removed through a valve at the bottom of the sample cylinder.