Book51 high-design frame with full ball-bearing wheels that allow 360° agility. Double-action parking brake on the rear wheels. Thanks to the innovative folding system, you can easily transport the frame like a trolley without having to lift it. Complete with a stable basket with practical loading and unloading assistance. Compatible with Primo Viaggio SL; Primo Viaggio i-Size; Pop-up sports car tower; Navetta XL; Navetta Elite; Navetta pop-up; Culla Elite; Pop-up Culla; Culla Primonido.