Looking to use one or two Filters at a time?  Get a Spacer Ring or two... 
 
Combine the Spacer Ring with the Glass Filters to use 1 or 2 filter color combinations.  Spacer Ring is not needed when using 3 glass filters.    
 
 
3D Printed Handle with no glass with Hummingbird Logo.  
 
Available in:
3" size for all Hummingbird Hues BLACK Slotted Collars
4" size for Hummingbird Hues original WHITE Slotted Collars and original Stanley Levine Light Units.