Great for your everyday multichannel work! Micro-trough in bottom to conserve reagents , RNase, DNase and Pyrogen free , Pouring spouts in all 4 corners Corner "bump-outs" prevent units from sticking together Wide flat flanges for stability, nearly impossible to tip over Standard 4, 8 and 12 channel pipettes are compatible with these disposable polystyrene reservoirs. Packed in environmentally friendly packaging and biodegradable bags, easy to open with tear-strip notches.