"Haakaa always uses environmentally friendly and safe raw materials such as stainless steel, glass, bamboo, and natural rubber. The best hands-free option to catch, and use all your excess breast milk. ""This is a must have for breastfeeding! The Haakaa Silicone Pump can be used to collect milk, help clear clogged ducts, or soothe sore nipples.” - Jacqueline Kincer, IBCLC, CSOM, Founder & CEO of Holistic Lactation"