Nalgene™180 is offered in 15 true metric sizes to fit your lab equipment. Transparent and autoclavable. Food-Grade material complies with USP VI, and USDA regulations. Replaces "close-to-size" Imperial-measure tubing that could leak at a metric connection. Clearly labeled and marked for easy cutting (four smallest tubing sizes are not printed). In 25 meter or 10 meter coils.