This litigation model was made for complete assembly and disassembly.  The hard components were made of painted acrylic (a.k.a. Plexiglas.)  Soft, transparent, colored layers were cast in flexible urethane rubber.  Tiny magnets were placed at the ends of the wires to facilitate a secure and precise connection to the layer below.  Ease of assembly, disassembly, and durability are key elements of a physical model in any courtroom demonstration.