The Mechanical Wool Dropper is a dropper that drops 2 cylinders every second with a base value of 3.5k. This item is great for beginning a basic setup after progressing for its relatively low power usage (12.24ku) and high base value.
This is an uncommon item found in the Gold Pack! Although it doesn't say that it is persistent, it actually is! There is also a Rare tier variant, known as the Concentrator Wool Dropper.