Instruct: Classify the given Amazon review as either positive or negative.
Query: Sub-par cocktail shaker

I used this shaker set for a little while. You COULD get it to seal if you really JAMMED it in there, but my biggest complaint is the strength of the glass. Seemed okay until I washed it (under cold water), put it down to let it dry only to return and see a giant crack down the side. The thing was split in two, was pretty pissed. Boston shaker glasses are supposed to be tempered to resist chipping and cracking, but this one clearly doesn't cut the cake. Well actually I could cut a cake with the giant glass shard that fell off it. Boo, Craphalon.