WHAT IS THE HYDROPHOBIC TAILS MADE OF????!!!!!!??????!!!!!!!!?

The phosphlipds constitute the cell membrane, in which the lipids is hydrophobic and phosphorylated gycerol.... that phospahte group is hydrophilic.

The lipids are ester of fatty acids, in cell membrane it is with phosphodiglceride...

in the below structure blue color represents hydrophobic fatty acid chain

If you're referring to the cell membrane, the polar phosphatidyl groups make up the hydrophilic head groups. Long chain fatty acid tails make up the hydrophobic ends.

The plasma membrane is an active boundary btw. the inside and outside of the cell. The plasma membrane determines which molecules may enter or leave the cell. The membrane is made up of a double layer called the phospholipid. Each phospholipid is made of a lipid and a phosphate group. The lipid (fat) parts are on the inside as they hate (phobic) water, and the phosphate side will dissolve in water.

picture===>> ooooo phosphate layer

|||||||||||| lipid tail

||||||||||| lipid tail

ooooo phophate layer

I'm assuming your referring to colloidal systems?

hydrophobic tails tend to be hydrocarbons as they don't H-bond

hydrophillic heads will be something like -OH

thats a very simple system. far more complex systems are more common as size of the head, length of the tail, critical micelle concentration points and functional groups make massive differences to complexion.