A thermoplastic vulcanizate comprising a dynamically cured rubber, where the rubber is peroxide cured, and a thermoplastic phase, where at least 10% by weight of the thermoplastic phase includes an ultrahigh molecular weight plastic, where the ultrahigh molecular weight plastic is characterized by a Mw that is greater than 0. The transformer assembly includes a first core section, a first side shield section, and a first upper shield section. The length from the main slit section to one end section in the circumferential direction of both end sections in the circumferential direction of the sub slit section, is longer than the length from the main slit section to the other end section in the circumferential direction.