My favorite adjustable dumbbells and the best of the PowerBlock series
I really like this product because it is compact and not as cumbersome as the larger sets. For most people this will suit their needs and they can get an upgradable set later on. The small size allows almost everyone to perform conventional exercises with proper form. With the larger PowerBlocks this is a concern because of added bulk and length.
The square shape of these dumbbells allows the manufacturer to put more weight in a smaller place. This makes these much smaller than other rounded adjustable dumbbells over the same weight range and increments.
From a safety perspective I also think these are the safest and most rugged adjustable dumbbells. However this does not mean that nothing can go wrong. You need to be conscious of inserting the pins straight across and the pin mechanism right side up so the magnets engage to hold the pins together. There is a also a backup elastic band to prevent a plate from falling but this might not save you in an overhead triceps extension.
This product is rugged and well made. It is less likely to break then some other brands and the concept is simple behind how the adjustments work. In other words there are less things to break or go wrong and I believe these can take a fairly hard fall and still be fine. I haven't dropped mine but I base this assumption on the way they are designed and the quality of the materials and how they are put together.
I would definitely purchase these if you do circuit training and want to keep your pulse up. If you become serious you can buy an expandable set over a larger range later. This is great entry point product.More detail ...

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