2IN1 Double Baby Bike Trailer and Stroller-Red Product Highlights: Frame:Lightweight and strong Made of Steel Made for two children but also can be used for one child. New hand lock brake system on the rear wheel so you can lock the jogging stroller when parked. Ultra smooth-rolling 20 aluminum quick release wheels ride easily across uneven terrain Sling seat w/ 5-point safety harness Extra security and comfort for passengers Fits in the trunks and storage areas of most vehicles after folded. Converts to stroller in seconds w/out tools No need to carry tools(conversion kits are included) Bike Hitch/coupler is included for connecting the trailer with bike and it also fits bike with quick release wheels. 2-in-1 weather canopy Helps protect kids from sun and rain Rear storage area and Extra room for parents to carry items Age limit:18 months or older Max Weight Limit:100lb Assembled Weight:37lb Front wheel size 12 Rear wheel size 20 Dimensions: Full Dimension:55x36x42 inch Folded Dimension:32x27x9 inch Includes: Child trailer folded Wheels(one front,two rear) Trailer/Stroller conversion kits Jogger handle Brake with lock Side frames(2 pieces) Safety flag Bike Hitch/coupler User manual