The culture tubes from test, It are crafted from consistently thick, Low-expansion borosilicate glass drawn by machine, Ensuring uniformity throughout feature consistent thickness to endure mechanical and thermal impacts. Are robust, The rims, Where applicable. Culture tubes without The rims are designed with robust fire resistance and polished edges that withstand the mechanical impacts of everyday handling. Culture tubes are ideal for cellular applications The included caps and washers for screw cap culture tubes are durable enough to endure growth repeated autoclaving. Cell growth is enhanced by culture tubes, And the included caps and washers on the screw cap versions can endure multiple autoclave cycles The base features a and the, Rounded shape cap is crafted from borosilicate glass