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Original Silly Putty A bit smaller than I imagined, a bit larger than a quail egg. Works nicely though!
BlockRs are made to fit standing straight up in the Dry Bin of your RollR or lay flat on the bottom of the TravlR. Use BlockRs to maximize the ice retention of your RollR, for less melt and more chill. Ice cubes melt, but a BlockR is forever.