From Areaware.

This glass bottle stopper takes its shape from the designer's line of hardware knobs while celebrating the beloved ritual of sharing a drink with friends. Hobknobbing, if you will. Pop it into an open bottle of your favorite beverage to keep it fresh and looking smart.

Materials:
Crystal glass with silicone

Dimensions:
Amber, 2 x 2 x 2.2 in
Blue, 2 x 2 x 1.8 in
Green, 0.8 x 2.2 x 2.2 in

Hand wash with warm soapy water. Air or towel dry. Not dishwasher safe.