What kinds of materials are used for these pump kits for Spectra pumps? Breastshields and valves are made of PP. Membranes are made of silicone. Tubes are made of silicone. All parts are BPA free. By Lisa Chiang|2019-10-31T07:04:31+00:0031 10 月, 2019|0 條評論 Share This Article FacebookTwitterLinkedInRedditWhatsAppPinterestVkEmail: About the Author: Lisa Chiang 留言 取消回覆Comment Save my name, email, and website in this browser for the next time I comment.