Special sling glandes with aerophonic properties.They are physically based on bull-roarer acoustics.
From wikipedia:
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Almond shaped leaden sling-bullets were typically about 35 mm (1 3/8 in) long and about 20 mm (3/4 in) wide weighing approximately 28 g (0.99 oz). Very often, symbols or writings were moulded into lead sling-bullets. Many examples have been found including a collection of about 80 sling-bullets from the siege of Perusia in Etruria from 41 BC, to be found in the museum of modern Perugia. Examples of symbols include a stylised lightning bolt, a snake, and a scorpion - reminders of how a sling might strike without warning. Writing might include the name of the owning military unit or commander or might be more imaginative: "Take this," "Ouch," and even "For Pompey's backside" added insult to injury, whereas dexa (catch!) is just sarcastic.
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some things never change...