As others have pointed out, they are not stackable - this is very clear from the product photos. If it was exactly this bug I would give them 4 stars. However, the big problem I have with this product is its poor solderability. Although I use a flux and get good wetting and flow with other components and the PCB, I can't get the same good flow with this product. This can also lead to problems with higher contact resistances at the connector/pin interface. Suitable for hobbies, hence 3 stars. Not recommended for professional use.
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