SORFA® Serological Pipettes All the pipets are manufactured with exclusively high-grade polystyrene (GPPS) which are excellent for clear observation and reducing liquid attachment on the pipet surface to assure accurate delivery. Furthermore, the universal design make the pipets are suitable for most brand of pipete-aid. All the features guarantee them can be safely used in cell and tissue culture, bacteriological, and clinical research. According to different needs, we can supply six different sizes: 1,2,5,10,25,50ml. Graduations are calibrated for accurate dispensing to within ±2%