An environmentally friendly alternative to foam bungs or stoppers used in the top of fruit fly vials. Made in Britain from non-absorbent cotton wool, these balls are ideal for plugging the tops of both our glass specimen tubes and small plastic drosophila tubes. The non-absorbent cotton wool ensures airflow without allowing mould to grow.
Sold in a single bag of 250. Great value options of 5 bags and 20 bags also available.