These are 6 oz drosophila bottles made either from polypropylene or polyethylene. They are firm, stiff neck for easier handling, and special designed neck to prevent the plug from falling in, with universal closure compatibility.

Size：57*57*103mm, Volume: 6oz（177ml)

Package: 200 bottles/bag, 1 bag/case 

Polypropylene (PP): Corrosion resistance, support high temperature and pressure, the material is hard, durable and reusable. 

Polyethylene (PE): Stable performance, good tolerance to chemical substances, excellent low temperature resistance.