Overall, I really enjoy this shelf, I plan to use to store all of my pets food & treats. It is sturdy & can be adjusted to how tall or short you’d like them. I love how you can attach multiple together if you’d like. The reason for 4/5 stars is because the photo shows black stoppers but this came with a cream/white colored ones & the “instruction” video the QR code you scan on the paper you received only takes you to a ad on Youtube not a installing video. The four black pieces that I show inside my hand, nowhere does it state what they are for so I assumed they were just there to keep the shelves from rubbing against each other during shipment. It would’ve been helpful to have that inside the instructions to let customers know what that was and that we could discard it.