Functional product to keep sofa cover in place

I got a sofa cover that came with the white round pieces that supposed to keep the cover in place. They popped out while the kids start playing on the sofa. I replaced them with this and they stay in place without any problem. Very easy to use ((of course needed a little force to push down the gap, because it was intended to be tight to keep the cover in place). Reasons I deducted one star: - It seems a slightly pricey for the material, though for its function it is worthy - The back piece it was kind of shorter than I expected for a sofa In all, highly recommended for its function

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