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Q-Tubes 700c Presta Valve Tubes
The Q-Tubes are my go-to for my fixie Eastside Commuter Bike. They are reliable, especially for the rough, sometimes damaged roads of Denver!

These are just tubes, but I really like Fyxation anyways
Ummm, these are just spare tubes that I bought. Just regular old tubes and I am just keeping them as my extras. So, I'm not really reviewing this incredibly standard product. They probably work fine. But in general, I really love Fyxation. They're in my neighborhood. They are friendly and helpful. Their treaded road tires are the best road tires that exist for commuting. After 20 miles of daily NYC commuting, I can honestly say that Fyxation's road tires last me at least 3-4 times longer than a pair of gatorskins for serious urban conditions (and potholes).
The standard for tubes
Great overall product. Fit my 700x23c deep rim wheels with the 48mm just fine. I prefer the smaller length so that the valve doesn't stick out so much. My experience with Q Tubes Presta valves is that the air needs replenishing on a regular basis (every 2 weeks with 5 days/week riding). But otherwise are a great choice and almost all bike shops carry this brand -- normally for $8 or $9.