Manufactured from virgin polystyrene with excellent optical transparency. Sterilized with gammer irradiation. Free of RNase, DNase and pyrogene. Unique design offers a smooth interior which prevents cell-hanging and clumping inside the pipette wall. Stable and break-resistant pipette tip offers constant flow each time. Optimized mouthpiece perfectly fits to all types of pipette pumps and balls. Filter plug at the mouthpiece prevents overflow of liquid and also eliminates contamination. Color coded ring mark at suction stem allows fast identification and sourcing. Sharp, black, highly visible permanent graduations prevent ambiguity and guarantee precise reading and accurate dispensing. Ascending and descending scales facilitate reading both dispensing and remaining volume. Reverse graduations show removed or remaining volumes on all pipettes larger than 1 ml volume. Pipettes are supplied individually wrapped in fiber-free color coded paper as easy to open packing.