These are probably some of the smallest drawn rosetta cane beads made, I have some green ones, about 2.5mm. My books are in storage, but in Picard vol. 7 these are pictured.
http://www.picardbeads.com/pubs.html#vol7
I have strung them to show their size. Appears to be 2.5 mm average.
Tiny chevrons like these are being reproduced in East Java today. The ones you have pictured seem old to me. I did not buy any while I was there.
But Jamey Allen has some examples from the trip he, James Langton and I made together a number of years ago.
Just Fred