These are just REPLACEMENT Scrubbers only. WILL NOT WORK PROPERLY WITHOUT OUTER MAGNETIC HANDLE (sold separately as the Scrubber Duckys starter kit). Stop wasting hot water and chemicals and use our Mini-Egg Scrubbers and just 1 oz of rubbing alcohol to clean the dirtiest glass you have. Our Mini-Eggs are also dual-sided. To flip your Mini-Egg simply flip the magnetic outer handle. Watch your Egg flip inside your piece. Each Mini-Egg measures 9.5 mm in size and will fit 10mm or larger standard down-tube holes. Use 90% or higher isopropyl (rubbing) alcohol for cleaning oily residue and for washing scrubbers after cleaning. PATENTED