Re-usable XT Freezing Core for use in CoolBox XT and CoolBox 2XT Systems. Provides over 8 hours of below 0℃ freezing with CoolBox XT lid on and over 5 hours with lid off. Pre-freeze in a -20℃ or -80℃ freezer until frozen, then place in CoolBox XT base when ready to work. CoolBox XT holds one XT Freezing Core.

CoolBox 2XT holds two XT Freezing Cores.

Dimensions: 6 x 4.25 x 2.25 in. (L x W x H)