Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not tough enough

The tubes are great while they last, but the first one I got the handle developed a tear during the first workout rendering it pretty much useless. Okay, just a manufacturing defect I thought; no biggie. Well it happened again on the replacement one. I contacted the company directly, who promised to send me another, but it has been over a month and nothing's arrived. The handles just aren't strong enough. It's probably not an issue for the lighter tension tubes, but not these. It's a great workout while it lasts. Cable training is highly underrated and I may never buy freeweights again. I will however, be buying another brand of cables from now on though.