The Bugaboo Donkey 5 Duo extension set gives you the freedom to convert your Bugaboo Donkey 5 Mono into a side by side double stroller. You can combine this box with the Bugaboo Donkey 5 base and the Bugaboo Donkey 5 sun canopy fabric to create a complete stroller for two children of different ages. Choose from available trendy colors to style it your way. This extension set comes with all the elements to make your Bugaboo Donkey 5 ready for your growing family: seat/pram body frame, carry handle, seat fabric complete, rain cover, sun canopy wires & clamps. The sun canopy fabric is not included but can be purchased separately.