Hi everyone, I'm sure this is a very much repeated question, but I couldn't find a straight answer anywhere, I'm in the UK and I can't think of what they would be. I am using this guide to built my blaster - David J. Syczylo www.djsyczylo.net - and below is an image he took of what he used. What is it because he describes it as "I have been asked where did I get the black rubber matt? I got it at one of those dollar stores."
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Thanks