The larval dippers are ruggedly constructed using polypropylene for mosquito research, education and control. The cup is 5? (13 cm) in diameter with a 3? (7.7 cm) handle and pour spouts on two sides (left and right) to avoid spills. It has graduated measurements in English and metric systems. It holds 350ml or 1-1/2 cups of liquid. The white background aids accurate counting of larvae.