This article relates to the Philips Avent breast pumps shown below.

Philips Avent breast pumps have a soft, adaptive cushion. There is only one cushion size per breast pump series. It is made of flexible silicone and designed to adapt to your specific nipple size: up to 18.6 mm (0.73 in) for the Essential manual breast pump and 30 mm (1.18 in) for other breast pumps. This unique cushion makes the pump effective by gently stimulating your nipple.