The base of the block is made of electrolytic copper while the top is made of quality pom acetal material the sealing is performed by quality rubber washers screw in brass standoffs are pre installed and allow for safe painless installation procedure ekwb recommends the purchase of aesthetic retention backplate ek fc rx 480 backplate black or nickel which improves the looks of your graphics cards and also provide some passive cooling to the vrm section ek also encloses a single slot io