• Lightly ductile cellulose caps • Breathable, air permeable • Single use, non-sterile • Can be sterilised by autoclaving up to 200 °C • Designed for work in microbiology and tissue culture • Can be adapted according to the dimensions of the test tubes, bacteriology tubes, Erlenmeyer, flasks and small bottles • Can be hermetically adapted by simple pressure in the neck of the container