Medela Conversion Kits come complete with all you need to convert from Lactina to Symphony. Converts a Lactina or Classic Kit to a Symphony Kit Includes - Protective Membranes - 2 each - Membrane Caps - 2 each - Instructions NOTE: This item is NOT available in retail packaging. Medela provides this part bulk packaged in polythene bags. Likewise, we use NEW & UNUSED polythene bags to ship these products to our customers Made without BPA: All parts that come into contact with breast milk are not made with BPA Unit Weight: 0.2 lbs Warranty: For hygienic reasons this product cannot be returned once opened.