Our Healthy Wave Professional Mats have an additional layer to double the damaging ions you get. Every product or service web page gives you the details of how many detrimental ions the mat can deliver. tst ivm.clk mmh2 clkh2 achf nopl spfp4 uam1 lsph nmim1 slnm2 crtt spfp misp https://proleviate.com/about-2-of-the-population-have-tennis-elbow/