Provides the critical, repeatable -1°C/minute cooling rate required for successful cell cryopreservation and recovery. Requires only 100% isopropyl alcohol and mechanical freezer. Labeled with graphic, step-by-step instructions. Holds up to 18 vials. Holder prevents vials from contacting alcohol – no contamination by wicking; no removal of labels or printing on vials. Containers with alcohol can be stored at room temperature, saving freezer space.