Yes, MIXERS is a Scrabble word!

Letter values in Scrabble US: M 3, I 1, X 8, E 1, R 1, S 1.

Is it a valid word?

MIXERS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a party of people assembled to promote sociability and communal activity
club soda or fruit juice used to mix with alcohol
electronic equipment that mixes two or more input signals to give a single output signal
a kitchen utensil that is used for mixing foods