this review title is: clever and simple design idea and the content is: i do not know if this listing will last because it is at the time of my order and review a four pack for the price of a pair elsewhere but you do indeed get four so i thought i would throw a review upi really like the design behind these you can mount them with screws on a flat surface or corner and with the included double sided sticky pads you can do the same without making holes plus probably get them on a round pole like a leg of a piece of furniture the plastic spikes are a good balance of stiff and flexible though between the two descriptors i would lean towards stiff i mounted a couple on my big cat tree one on a corner and one on the base flat they obviously blend in fine there but they are small enough that they would be discrete even if they were put somewhere more out in the open my cat likes them well enough she is not as enamored with them as i had hoped but i have caught her getting the side of her mouth on them more than once alreadybetween the cheap price and the non damaging sticky pad option they are worth trying out if you think your cat would like them if not no big loss.there are other information for this review, one is this reviewer did purchase it and the other is 0 people think this review is helpful.