An eyebrow pencil such as this one lets you experiment and play with the shape of your eyebrows and get them just right. The pencil makes this product very easy to apply.
From Sephora
Nars Brow Perfector 0.1G Nӓia
John Lewis & Partners
Nars Brow Perfector Eyebrow Pencil
This product is also available at 1 unverified store.