These appear sturdy and with a good spring. Haven't had a chance to put them to good use so not sure how long the spring will last. The joint also seems sturdy as opposed to many others this size. We plan on purchasing more of these.I use carabiner clips to hold my box cutting knife when I'm on the clock. The one I have been using seemed like it was getting worn out; the part that you opened to put things in the clip was getting misaligned and the color was coming off. All this told me it was about time for a new one.Included with this order are twelve of the clips in different, numerous colors, ten keyrings, also of various colors, and a small, flat, somewhat transparent box to store everything.The colors for the clips include three blacks, lime-ish green, purple, teal, blue, red, orange, gold, and magenta. The colors for the keyrings are two blacks, blue, purple, red, green, lime-ish green, yellow, orange, and purple.Compared to my old clip, these are slightly bigger and can, obviously, hold more things. The construction seems durable.The clip also advertises that it can hold less than or equal to sixty-six pounds. To test this, I put a fifty-three-pound kettlebell and a ten-pound dumbbell (this is the closest I can get to sixty-six without exceeding it) inside a lightweight plastic bucket and picked it up with one of the clips functioning as a handle. I can honestly say the clip held up pretty nicely. I held it for a solid ten seconds. Granted, my hand was hurting because of the awkward way I held the clip, but that's beside the point. I was impressed that it held up.Overall, A great buy. Highly recommended, especially after my impromptu test.Mostly used for keys but plan on using them as stocking stuffers at Christmas. My grand kids love themI liked the design and claimed strength of the larger carabiner. All of the units feel light and easy to deploy.Used to hold baseball cap to backpack, toys to a strollerVery good quality for the priceNothing special about these but certainly adequate for light duty at a reasonable price.These work very well. Loved the colors and case.