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If you want to add some weight to your flowtoys than you can add these flowmass over your crystal cases. By adding these to the end of your cases it will give you more momentum for fluid moves. The mass can be easily installed onto crystal cases, all flowpoi, staffs and other tubing based flowtoys. If installing onto tubes, apply a tiny bit of lubricant to the insides of the mass before installing on tube. If installing onto crystal case, do NOT apply any lubricant otherwise the mass may fly off while spinning.