Source: Amin, K., Teoh, V., & Jemec, B. (2013). Microsurgical i-Trainer: a low cost method to replicate a microscope. Annals of the Royal College of Surgeons of England, 95(1), 79. https://doi.org/10.1308/rcsann.2013.79
The article provides a 3x zoom image of straw ends being anastomosed using 7/0 prolene.