Thank you for viewing. Set of 4 It's held together with screws, so there are no protrusions, and it's the type that doesn't hurt your lower back. If you want shipping with a guarantee, there will be an additional charge, so please let me know before you bid. Regarding the condition of the item, I check it before listing, but please refrain from bidding if you are looking for perfection. Feel free to ask any questions ♡