A materials mystery: What the heck are self-healing cutting mats made from? And a possible alternative - Core77

Last year Core77 forum moderator Timf posted, The other day one of my students asked me what a self healing cutting mat is made of. I have done a search and only found the mysterious phrase "made of a unique self healing composite material". Does anyone know what they are

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anezus Self Healing Sewing Mat, 12inch x 18inch Rotary

anezus Self Healing Sewing Mat, 12inch x 18inch Rotary

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