SEA-GEAR Model 9100 Student Plankton Net is available in 13 and 20cm (5 and 8”) diameters with a standard length in a select range of mesh openings. Student Nets have a Stainless-Steel net ring sewn into a nylon mouth collar and feature a 250 lb. test three-point bridle with a stainless-steel tow eye. The cod end diameter is 5cm. Light-duty construction is a good choice for classroom studies. Each net is equipped with an internally threaded jar holder, hose clamp and two collection jars. *Student nets are not designed for towing.