I noticed that some G-Shock models have a "rubbery" feel to them, but others have a plastic/rubber feel to them. I.e. The DW-6900 has a rubbery feel to the band and case, but the Mudman and DW-5600 G-Shocks have a plastic/rubber feel to them, almost like it's made from a harder material which is less soft than the DW-6900 G-Shocks. Does anybody know the differences in materials between the two?