LEGO Technic Linear Actuator (Large) - includes Bracket;

This Technic Linear Actuator will give you more precision control, and can be geared to go faster or slower, for those LEGO projects that need this particular application.

Unlike a pneumatic cylinder which uses compress air to move the piston, the linear actuator uses rotary motion which is converted into linear motion via gearing to move the piston up or down.