Designed by Garrett Brown, the Steadicam Merlin Camera Stabilizing System is a lightweight handheld gimbal stabilizer that lets you capture smooth, professional-looking footage whether you go up or down steps, indoors and out, through crowds, or wherever else the shot takes you. It weighs just 1.4 lb and its counterbalancing weight.

I have never used this item, and it looks all complete, with box, weights and manual.