Yes, @rauliruegas To make a rhyme you could say Tran Van Tan is the man.
BTW, I see your comment "Sp-10s needs not those kind of metal mats" but can tell you that in my system with the SP10mkII, EPA250 and the Signet 111E that I bought from you, the 4kg SS mat is a definite improvement and a number of listeners including respected audio manufacturers who heard it in my system all agree that's the case. FYI, I looked around for the AT mat prior to purchasing mine, but not too many of those around anymore, their big suggested footers too. Cheers,
Spencer