A truncated icosohedron made from .1" acrylic sheet.Cut out the pattern and assemble it. There are two layers in the bucky2 file, one for each color. The hexagon-hexagon connectors and hexagon-pentagon connectors are different angles, and cannot me interchanged. Having them done in different colors helps to keep them straight. I recommend building the thing in two halves, and putting them together. I used TAP acrylic cement to glue the thing. The connectors snap easily when you are trying to get those last few sides in, so I cut a few extra.