From the Orlich website...
Orlich drums use beautiful beveled glass and brush-finished brass to produce an instrument of superb musical intonation.
Since 1989 drummer/glass artist, John Orlich has been crafting the actual glass drum. The drums are outstanding musical instruments. In addition they are quite collectible works of art and are financial investments. Each drum is handmade, signed and numbered. Stock sizes will accommodate most drummers’ needs, though drums of custom size can be built to order. Orlich also offers special personalized touches such as glass etching and custom patinas.
Orlich drums will not break from musical use. Though made of glass and perhaps requiring a little more handling finesse, the drums are quite tough due to the superstructure of brass which holds components together. Unless your roadie or drum tech is a complete gorilla you should not fear this material.