Techniice Heavy Duty Reusable (HDR) Ice Packs - 20 sheets Techniice reusable dry ice sheets can be cut to sizes with generous 25 x 40 cm per sheet and 24 individual cells per sheet Techniice reusable dry ice packs are lighter than the same volume of ice Techniice reusable dry ice packs last upto 6 times longer than the same volume of ice Australia's only FDA Approved reusable dry ice packs - safe non-toxic polymer Techniice reusable dry ice packs will freeze to any temparature, right down to Minus 190