The Yepp Mini threadless handlebar adapter can be attached to a non-quill type steel stem or Ahead system for the handlebar. Make sure your bike is able to carry the additional load. * Dutch Design meets Safety: Meets stringent European safety requirements and ASTM standards. 5-point safety harness with user-friendly buckle and easily adjustable footrests with straps provide optimal protection. * All Yepp child bicycle seats are made of flexible rubber foam which is very comfortable and shock absorbing. It has a high insulation factor (summer and winter) and no watter penetration thanks to closed cell-structure. * Safe, Easy to Use, Comfort, Award Winning Design. Quick and simple to snap into place and detach, lightweight, anti,bactirial and easy to clean. Easily secured with anti,theft lock. * Use the Yepp products only on a bicycle that is in good working order and of the type suitable for carrying the additional load. Contact the bicycle manufacturer to obtain this information.