This adapter securely attaches your car seat to your Baby Jogger stroller, making it easy to turn it into a customized travel system. You can even fold the stroller with the adapter attached. 4.5" x 1.6" x 13.8" Fits Baby Jogger City Select and City Premier strollers, not included Compatible with Chicco KeyFit 30 and Peg-Perego Primo Viaggio car seat models, not included Plastic Imported Kids' Wear