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There are limits on the thickness of the rubber only but contrary to popular myth, there are no limits on the thickness or width or length (height) of a blade or the width & length of a rubber in tabletennis

However to measure blade width & height accurately (as if it matters) use the following LOL

https://www.aliexpress.com/item/3256801754785076.html

Nice
I ordered one
300 mm is a feet and covers all blades.
The smaller ones did not work for large blades