Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
this works great like the other reviews i had seen, although i was curious about how thick the marker was, it as indeed al little thinner than i expected and wouldn't be suitable for maths teachers, but suitable for private tutoring or for use on a small whiteboard for note taking. overall it works great so i would recommend if you want a thin whiteboard marker.
I have just received my markers. I thought I should test them out. After testing all of them out, I found that more than half of the markers were faded out. I feel like the markers have been used and then re-packed! Definitely wouldnt buy again