The Falcon Eyes SGA-HC1010-3 Honeycomb Grid is compatible with the Falcon Eyes SG-100 Strobe Gun. The SGA-HC1010-3 has a diameter of 10 cm and allows you to bundle and direct the light emitted from your speedlite. 
In order to use the SGA-HC1010-3 with other speedlites, a Falcon Eyes CA-SGU adapter must be used. .