Northstar's Borosilicate CANARY YELLOW Rod is an intensely bright opaque color. Stay out of reducing flames to prevent boiling or else encase in clear. This is First Quality Glass Rod approx. 7mm in Diameter with a 20"Length. All colors shown after being flameworked. Available for Purchase in Full, Half, & Quarter Pound Increments. (Also available in 5 LB Bundles at a Discount Price)