Translucent lid with a little Batty Fibers bat with a matte base. 
 
These boxes fit both deconstructed Acorn Original and Acorn Lite spindles.
(I keep finding new things that fit as well: Kaweco Sport fountain pens, pocket sewing supplies, cable needles, etc)
 
Acorn Box Measurements:
Weight: 26g
1.5" x 4.5" x 0.75"
 
This item is print to order to reduce waste and may have a couple of days of lead time.