Here are my old school Bat Swarms which form part of my larger Vampire Counts force. They are considered a 'chaff' unit and can be used to soak enemy missiles as well as flank the enemy causing their attacks to 'miss' more often.
These guys were pretty simple to paint yet they look good on the tabletop. I used black to start then built up with some Blue/Grey highlights, then used white/red to pick out the teeth and eyes respectively.
These particular models are cast in metal and are quite rare to come by nowadays.
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Peace.
~James