4Pcs SG90 9g Micro Servos for RC Robot Helicopter Aeroplane Controls Car Boat

Good customer service; helped me in a pinch. make sure you use 5v power as 3.3v is too low for these models, I guess.

Good servos. For the makers amongst us, the servo spline is 21 teeth at .25 modulus that you can make in fusion and print with a resin printer

At 50Hz a pulse width of 0.5ms corresponds to (0 deg) and a pulse width of 2.5ms corresponds to (180 deg). So a 2.5% duty cycle to 12.5% duty cycle is the range. The photo depicts 1ms(0 deg) to 4ms(180 deg) as the range which is not correct. All 4 worked normally and were able to traverse 0 to 180 degrees. They are not high end servos but for the price they work fine.

I am using this micro servos for a small robot for STEM. it serves its purpose. it seems to be good quality servos. I still have to test them to see how the gears hold to a constant use.

Typical SG90 servos. Great price, but they're noisy and break easily.