Amazon calculates a product’s star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers, and factors that establish reviewer trustworthiness.
Purchased to replace the factory seals while replacing the compressor. Fortunately, I did not have to use any of these seals during my install, as all the parts I was replacing came with enough seals to replace all of them in the system. However for the price, I have decided to hold on to them as spares, just in case I ever need to break open the A/C system in the future.