4Pcs DC 12V Micro Push Pull Solenoid Electromagnet Mini Solenoid Linear Actuator Magnet Valve 4mm Stroke Open Frame Solenoid Electromagnet Linear Motion 5.5W 0.15N

These items are very small. They look nice, good quality. It should be fairly easy to connect them to your project. I have not yet energized them.

As expected

Not verry strong. Will need to buy stronger

These are the smallest solenoids I can find, which is perfect for the 40% keyboards I am using them in. They make a very decent amount of noise when whacking a keyboard case. They work as advertised. They do require at least 12v to fire, 9 or 10 absolutely won’t cut it. The reason I am deducting a star is they are dry as a bone out of the package and will not work well without lubrication.

I agree with the many comments about these being too weak. But I decided to review with a 5 star just to explain the point below. The force of 0.15N if you want to feel it before buying is the same as holding 15 grams (~ half ounce) in your hand. Its very light!!!!! I didn't measure the solenoid itself to confirm it delivers 0.15N. But one should expect it to be weak. * Another example: Holding one pound ~454g would generate about 4.5N of force pulling down.