The high-efficiency reduction collar of this net enables quantitative vertical plankton hauls. Dacron collar is supported open by double stainless steel rings (20 cm and 30 cm diameter) and is sewn to a 30 cm diameter x 90 cm long x 48 u, 80 u, or 153 u Nitex nylon plankton net. A three-point stainless steel bridle, two-piece PVC collection bucket (lined with 48 u, 80 u, or 153 u Nitex mesh), 20.0m line, and nylon carrying case are included.