RuneScape Classic Wiki
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The main RuneScape Wiki has an article on: Beer glass
The Old School RuneScape Wiki also has an article on Beer glass.

A Beer glass is obtained from making glass in the Crafting skill and also from drinking a beer. Making a beer glass can be done by using a glassblowing pipe on molten glass. It requires level 1 crafting to make and gives 17.5 crafting experience.

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