Need help with valve covers leaking

get these you won't look back. I've had them off 5 or 6 times and they still seal tight. I have Edel alum heads on my 340 and 273 Commando covers.

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Are these a black rubber type gasket? Back around 86/87 I bought a set of MP, might have still been Direct Connection , cant remember, gaskets for a 440, they were that type, reusable and never so much as weeped. Best valve cover gaskets I ever bought. I just scored me some unused Moroso gold anodized aluminum covers and those would be my choice, or the Moroso gaskets?