These are always the go to. I recently purchased a #5 and #6 to hopefully get into wider stuff and I'm excited to try them out.

https://www.youtube.com/watch?v=TWVSyoTqPWY

Used the C4 #5 out in Vedauwoo and in Devil's Tower. Worked extremely well and easy to use and set!

I'm not sure how Black Diamond does it but the sizing of the C4's are incredibly intuitive. I have a single rack of metolius and a single C4 from 0.5 - 4 camalot. It seems that more often than not I get sizing correct on a placement in c4 faster than in Metolius given the larger camming range. That being said Metolius is my preference in the smallest sizes. Overall a great value .

Cams alot! have 3 of each so I would say they are good.

the only cam I trust my life with.

Black Diamond c4's seem to hold the standard among cams.
I've used most other brands and none seem to function as smoothly as these.

These cams are great, easy to place and very reliable!

No hype, no bull, exactly what you'd expect from BD products. Such peace of mind when you locate solid rock, just park the Caddie, clip n go, send, and enjoy the view!

I've been using these cams for years and they continue to impress me. The ranges are much more forgiving than other brands that make cams this size, making these cams the go to for all sizes offwidth.

The Cam lobes on these are a perfect logarithm, which means - when placed appropriately, they will save your life with an evenly distributed force into a rock. The pioneer of trad-climbing, these cams have evolved over time to become the safest active pro on the market.

There's a reason these things are the standard. Durable, reliable and bomber.

C4s are the backbone of many a trad climber's rack, and they are rightly so. I love the expansion range the double axle design gives the cams, I love the durability of these bomber pieces, and I love the simplicity of their design. Such a well designed invention, no wonder they are a tried and true staple of the cam industry!

These are some of the best all around cams. Learned to climb with these cams and have owned them for years. I need to resling a few through Black Diamond but after that they'll basically be new again!

If you're looking for a solid, easy-to-use, convenient and color-coordinated trad rack, start here. These cams are sturdy and strong, can be used tons of times and then still continue to work exactly how they're supposed to. I lead my first 10+ the other day and relied on mainly 2s and 3s to get me up in, despite my few hangdogs on these cams. Felt safe the whole time, even in sketchy situations. I'd recommend this pro to anyone.

Took my first ever fall on gear last week. My foot slipped unexpectedly and while in mid-fall I realized like I never had before that I wasn't on bolts anymore. After being caught I looked up in horror, not quite ready to accept that I was still alive and well, until I saw my #3 still right where I had placed it. These things hold like champs and inspire confidence. I anticipate taking more falls on the c4's in the future and trust that they'll continue to keep me alive. I'd recommend them to anyone.

Light. Per expected. And impressively so. Compared to a standard C4 the difference is very evident.
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Feedback from relative: "Great, durable product from a trusted company. They are light and easy to place and to retrieve. No complaints come to mind when I think of Black Diamond cams and I will be purchasing many more to complete my trad rack."

I think that the volume of positive feedback speaks to the C4s quality.
There are other cams that are better suited to specific placements/ different rock types but I don't think that there are any with a double axle design that span such a wide range of crack sizes.

There is no better camset for the price.