I was gifted it by a friend I met several years ago who runs a laser business in Denver. Originally I had ordered linoleum because I had/have no idea what I was doing. I asked her if there was a place in Denver where I could purchase some(there is not) on short notice and she gave me a few sheets due to the lack of places to purchase it in person. She rarely uses it she said, so by giving me a few sheets it would see use 
Itâs âLow Odorâ Laser rubber and Iâm not too concerned with the cleanup. I worked in a frame shopâoh my godâalmost 20 years ago in high school and they had a laser for making rubber stamps and they did NOT use low odor rubber. Maybe it wasnât invented yet, but iâll take the low odor stuff over the stinky red stuff. I couldnât smell this stuff at all while engraving it.
This is what the edge of a sheet looks like:
