Protect enzymes and temperature sensitive reagents or samples during transport, storage, or use. A pre-chilled ArcticIce® will hold the specified temperature range up to 3 hours. Contains a non-toxic freezing gel that also protects samples from frost-free freezer cycles. Reversible 20-place polycarbonate block has numbered positions for 1.5, 2.0, or 0.5 mL tubes. Includes a clear lid with stacking rim. Measures 6" L x 4" W x 4" H.