This is a package of six white membranes with offset mounts to be used with Medela breastpumps. The price of the six pack saves $1.21 over buying the membranes separately. For use with all Medela breastpumps EXCEPT the Freestyle breastpump. Medela White Membranes are BPA-free.
The Importance of Regularly Cleaning White Membranes
Both the yellow valve and the white membrane should be cleansed immediately after using your breastpump. Before cleaning, remove both the yellow valve and white membrane from the breastshield connector, and then remove the white membrane from the yellow valve. If the yellow valve and white membrane are not cleaned every time the breastpump is used, milk will likely remain trapped between them, making the white membrane sticky. This will prevent the white membrane from moving properly during pumping and decrease the effectiveness of the breastpump.