The nipple of the BIBS baby bottle is made of natural rubber. As natural rubber is a natural material, colour variations may occur.BIBS nipples are available with two flow rates: slow and medium. Round dummy made of natural rubberDesigned with anti-colic function.The round tip of the dummy favours the same tongue position and sucking technique as during breastfeeding, as the round shape allows the sides of the tongue to be lifted and pressed naturally against the nipple as during breastfeeding. This also prevents 'nipple' mess when you breastfeed and bottle feed at the same time. The tip of the dummy has an anti-colic valve that lets air out and reduces air suction during feeding. The tip of the dummy is made of natural rubber. As natural rubber is a natural material, colour variations may occur. This set includes:Two natural rubber round dummies with medium to slow flow The feeding bottle complies with the following standards valid on the European market: EH 1400+A2ET 14350: 2020ET 71-3-2019DIN EN 12868 2017-04DIN CEN 1186 2002-07DIN CEN/TS 13130-23 2005-05DIN CEN ISO 11885 2009-09