Why are these short hair stubbles not growing after FUE 10 months ago? (Photo)

Will they fall out naturally with new hair growth to follow? Had FUE with 3000 follicles last Dec17. Good progress in hair growth, though density is lacking. Noticed many stubble type hair that is not growing out fully. They feel rough and sharp to the touch. I pulled a few and they glided out quite easily. I've taken a magnified picture of this shaft and wanted to understand what this may be? The curved end is below the skin level Dead hair in a healthy follicle? Should I pull out these dead hairs with tweezers? Will new hair grow in the follicle?