Willow - Breast Pump Sizing Kit - Flange Sizing Kit - Use w/Willow Go, Wave, or Most 24mm Flanges - Includes 13mm, 15mm, 17mm, 19mm, and 21mm Inserts- Breastfeeding Essentials for Postpartum

["Experiment with 5 sets sizing inserts; Includes 2 each of 13mm, 15mm, 17mm, 19mm, and 21mm Inserts","Nipple Sizing Tool to easily find your fit; Connect with a Sizing Specialist for personalized guidance","Use with Willow Go, Willow Wave, Willow 360 or any pump; they’re compatible with almost all 24mm flanges","Pump Sizing 101 Guide with everything you need to know about maximizing comfort"]