Freeze cartridge in a -20℃ freezer until frozen, then place in CoolBox 30 base.  Place pre-chilled CoolRack tube module of choice on the cartridge.  Samples stay frozen (-20 to 0℃) on the bench for up to 6 hours with lid on, 4 hours with lid off.  All samples have identical cooling profiles regardless of well position.

Re-usable and highly durable. 

3 per pack.

Made in USA.

Dimensions (L x W x H): 10.8 x 10.2 x 2.5 cm / 4.3 x 4.0 x 1.0 in