Match your Peg Perego Booklet 50 stroller with a selection of car seats using the Peg Perego Adapters for Maxi Cosi, Cybex, Nuna, and Clek Car Seats. The adapters easily fit onto the Booklet 50 and allow the compatible car seat to safely click onto the stroller. The Peg Perego adapters quickly snap onto the chassis arms of the Booklet 50 stroller. The Peg Perego Car Seat Adapters are Compatible with the Following Car Seat Models: Maxi Cosi Mico NXT Mico 30 Cybex-Aton family Cloud Q Nuna-Pipa Clek-Ling. Stroller folds compactly with the adapters on. No need to remove adapters.