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Officially-licensed Portal Companion Cube bead, perfect for holding down any 1500 megawatt heavy duty super-colliding super buttons you might encounter. Discreet enough to be classy, but still instantly-recognizable to fans.
This bead measures 0.4 in (10 mm) per side. The hole is 0.08 inch (2 mm) to accommodate most thread, line, or wire. If you need one with a larger hole, have a look at this version.