cassette

cassette
/kəˈset; kə`sɛt/ n
small sealed case containing a reel of film or magnetic tape （盛胶卷或磁带等的）封闭小盒
    [attrib 作定语]
a cassette recorder, ie a tape-recorderwith which cassettes are used 盒式录音机.

牛津英汉双解词典