Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Beware: Heavy Steel

Nice and long to attach your bike rack to your bike, but beware, these things are really heavy steel. I only gave them 2 stars because they are cheap and they do the job, but I didn't mount them on my bike because they are so heavy. Not worth the extra weight. Take my advice, get more expensive aluminum ones that won't weigh you down.