oh what i was told was the plastic pipe cost only a few or ten dollars each but the metal one cost maybe a few time but still not expensive for running for a few sockets. bending the plastic tube needs a simple tool and very very easy but bending a metal one ..... you need a bulky machine lies on the floor and requires brutal force to bend it.
anyway, if you can afford the metal pipe go for it! and get a bigger one too.
i have four sets of separate/individual sockets, all wires run inside the 2 plastic pipes ..... i only realised i should four metal pipes to serve them separately after the work done.
1. AV amp x 1
2. AV bluray player x 2
3. AV subwoofer + PS Audio Duet (TV + CD Demagnetizer)(英式)
4. Projector x 1
5. Magic TV Box + Android TV box (英式)
6. 2- channel CD player + Music server
7. 2- channel Integrated amp.