Concept One Step 300ml Contents: 300ml x 3 bottles x 4 boxes Instructions: Before handling lenses, always wash your hands with soap, rinse thoroughly, and dry them. Always use the dedicated case. Never rub or rinse with Concept One Step disinfecting solution. Before disinfecting the lenses, it is recommended to rub and rinse with Concept Rinse Solution (sold separately). This can further reduce the bacteria adhering to the lenses.