To make /ɛ/ raise the front of your tongue towards the front of your mouth. /ɛ/ is shorter when it comes before a voiceless consonant than when it comes before a voiced consonant.
To make /ɛ/ raise the front of your tongue towards the front of your mouth. /ɛ/ is shorter when it comes before a voiceless consonant than when it comes before a voiced consonant.