Alcohol Cups Crystal clear, plain cup. For alcohol, benzene or other solutions. Edges of covers and cups are ground to form a tight seal, keeping dust from entering and protecting solutions from evaporation. 23-159 has a 2-3/4" diameter, 2" height, 3 oz. capacity. 23-161 has 4" diameter, 2-3/4" height, 8 oz. capacity.