Never used NUK set! All items are BPA Free. And each set includes: Four NUK Simply Natural bottles: two 5oz bottles with slow flow nipple and two 9oz bottles with medium flow nipple. The NUK Simply Natural bottles provides baby with a close-to-mom feel never before found from a bottle. The comfortably familiar nipple feels, works and moves just like mom's. Advanced 1pc Anti-Colic Air system helps reduce colic, gas & spit up. Includes 3 pacifiers per set!