This plastic storage rack for Eppendorf test tubes can be used safely for -70 freezer storage. Failure of labeling tape adhesives is a major problem at extremely low temperatures. The inset view in the larger image (click on thumbnail) shows the dovetail slot machined into this rack. Dymo© brand embossed plastic labeling tape (3/8" wide) can be slid into the slot and held captive for secure labeling. The rack holds 150 Eppendorf tubes and is 1 1/4" x 12" x 13".