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The Banana Skinny Grays are outlines caps just like the yellows and the whites, only the entire cap is gray instead of the dot.

Banana Grays work on most European cans as well as Rustoleum "Stops Rust" and Krylon "5-Ball" (both with the old female vales) and spray lines from 3/8" to 1 1/2" in width.

They also go by "German Outlines"  or "German Thins" because they are the original German outline caps.