Free of detectable DNase, RNase, human DNA Non-pyrogenic Resistant to DMSO Can be used in a temperature range between -20°C and + 60°C Round nap shape and therefore suitable for sealing the 1 ml and 0.5 ml 96 Well MASTERBLOCK®, in addition to standard 96 well polypropylene microplates. The 96 well F-, U-, and µClear®-bottom polystyrene microplates may also be sealed (except 96 well V-bottom polystyrene microplates) Not pierceable