This o-ring set is really good. However, both the product description and the label on the top of the case (which can also be seen in the photos) state that the dimensions are expressed as OD x thickness, where OD is the usual abbreviation for OD. However, the o-rings in the kit I received are ID x thickness, where ID is the standard abbreviation for ID. Interestingly, none of the reviews I read mentioned this. So, for those who just want 18 random sizes, they might not care. However, I only ordered this set to get a specific size, 14 x 2.5mm (in other words, 9mm inner diameter and 14mm outer diameter). So while a size is marked as 14 x 2.5mm, this size corresponds to an actual inner diameter of 14mm, i.e. 14mm inner diameter and 19mm outer diameter. Also, the size of 9mm included in the kit is 9mm x 2mm, not 9mm x 2.5mm. Interestingly, Revain also recently removed the ability to correct incorrect product information that used to appear on product pages. If the seller corrects the item description and the label on the container, this could be a really good set.
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