3" x 10'' chimney with 4'' bulge.
Borosilicate glass, very smooth, with flame cut ends that virtually eliminate end ''flaking'' or ''flea bites.''
The 4'' bulge WILL NOT FIT through the bottom of a ball shade. (Limit two chimneys per order/per package.) 3" base for flat wick lamps such as #2 Queen Anne burners.
