Bike seat for toddler that attaches onto back of adult bike (not a tag-along). I got this last summer from another Freecycler, hoping to use it for my grandchild. Ended up not using it. Since I did not try it out, can't comment on how well it worked. Please see attached picture of all the parts that came with the item. If at all any part is missing, it could be probably obtained from a bike-shop.