Emulait Starter Kit × 1 Shape 4 (most common) / Light *just washed once never used Product details: Aerophagia (anti-colic) system to reduce air swallowing Simulates the elasticity, texture, feel, shape, color, and milk flow rate of a real nipple Interior fibers mimic milk ducts and simulate the texture of a real nipple Slow, medium and fast flow rate controls Comfortable ergonomic grip for caregiver and baby 3-part easy assembly Graduation marks for easy measuring Dishwasher safe Holds 8oz/240ml BPA-free, phthalate-free, non-toxic, FDA-approved medical-grade silicone