This is one of those items that their usefulness surpass by far its cost. Used correctly and with a good sharp knife will do its job. The only flaw is that the material is to flexible and you must be very careful not to damage its ribs. It's the same concept I have used in restaurants all my life.
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https://www.amazon.com/gp/aw/d/B0742M7MDW?psc=1&ref=yo_pop_mb_pd_title