AThe photo's not very good quality so it's hard to see. Maybe pieces of thin fondant or white chocolate/candy melts? - you could drop spoonfuls of choc on a tray and use a spatula to pull them out to elongate and thin them. But I'm not sure what is ACTUALLY used here sorry.
That is exactly what it looks like to me winniemog and probably what I would do :-)
Thanks ladies. I will practice this technique.