The Medela Wide Base Teat set includes 3 - wide base silicone nipples.  They are available in slow and medium flow for feeding newborns and infants. 

Features:

• Compatible with all Medela breast milk bottles: Natural feel and shape
• Can only be used with wide base collars : Medela breast milk bottles come with wide base collars. 
• Easy cleaning: Nipples/teats may be cleaned in the dishwasher, Micro-Steamed, boiled or washed by hand
• Made without BPA: All parts that come into contact with breast milk are not made with BPA