Parts don't float on water

Hello, I am creating an obby whose shares should float in the water but they sink. Does anyone have a solution so that the parts stay on the surface of the water?

Anchor the parts.
(Part->Properties->Anchored)

nevermind, do what tritium said below


Enable CustomPhysicalProperties, and set the density of the basepart(s) in question to a value that is between 0, and 1. The closer this number is to zero, the higher the buoyancy forces will be on the basepart (this will mean that a higher percentage of the part will be above the water, while a lower percentage of the part will be underwater). If you set this number closer to one then a lower percentage of the part will be above water, while a higher percentage of the part will be underwater. If you set it to a number that is above 1, then it won’t float at all.

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