Material: Made of nylon PA66, it has good mechanical strength, excellent hardness and wear resistance, self-lubrication, good oil resistance, excellent gas barrier and heat resistance, excellentfluidity and moldability.Protects children: prevents children from removing their arms from the seat while driving, invaluable safety for a small effort.Prevent seat belts from falling off and give the baby more safety guarantees.Note: The item will need to remove the seat belt from your car seat in order to pass it through this buckle.If the seat belt cannot be released, the item does not fit it.Great accessory: It is a great accessory that will help you find the seat belt and keep the child safe.Fits most car seats, the right size stroller will fit most children.Safety trunk button, integrated unlocking is more secure.Package: 4pcs Black Baby Chest Strap Clips Specifications 14.6*4cm/5.74*1.57in.