These solid aluminum blocks are a highly efficient thermal conductor. They provide excellent temperature stability when used in ice buckets and help keep tubes supported. When using directly on a benchtop simply pre-chill blocks in a refrigerator or freezer for up to 15 minutes. Offer greater convenience and versatillity than gel filled coolers. Blocks are anodized to prevent corrosion. Solid aluminum blocks Ideal for use in ice buckets Variety of styles