The Rat Worx Mini MRX is basically a scaled down version of their popular MRX chain drive auto knife. However, certain dimensions were kept the same to ensure ease of use.
The most notable feature is its self-cleaning miniature roller chain, which joins the knife to dual-nested right and left-hand wound extension springs. The blade is machine hollow ground CPM-154 steel, and the machined aluminum handle is class III hard coat anodized.
The blade pivots on a permanently lubricated ball bearing washer system. The Mini MRX comes with a lifetime warranty.
To shop for Rat Worx MRX chain drive knives (blade version shown in video no longer produced, but this is even cooler):
To watch my review of the original MRX: