The first part is pronounced as /stei/ and last part is pronounced as the weak form of 'them'. The 'th'-part might change a bit, that is, it may be pronounced with a fortis dental fricative, as in 'THink' or as its counterpart, with a lenis dental fricative, as in 'THe'.
Hope you got it, I know it would have been easier to post the pronunciation with a straightforward phonemic transcription; however, I have never managed to post them so that other people would see them too.