Capacity: Approx glass (high borosilicate)

Note1:

This double glass cup is a vent is normal, is because to prevent the glass in the high temperature production led to glass rupture. Only a small probability will lead to leakage into the water, does not belong to the quality problem. Can not use soap and water and so on to clean the outside, it is best to use water to clean, after cleaning use a clean cloth to wipe clean.

Note 2:
We have this Fox Double Glass Straw Mug, the instructions on the back have been updated and are now gone, it is to add better viewing and only the product instructions on the bottom of the mug remain.