Our 4.0's are the 13x6 frontal wig versions to our hair textures. Frontal wigs offer some versatility and have a better longevity compared to sew ins. Our frontal wigs come in 150% density . Density is defined as how thick or thin you want your hair to be. Inside of the lace frontal wigs there are clips and straps for extra security. Also keep in mind that our HEATHER blonde is processed hair . If you are trying to do bright colors please refer to our HEATHER 4.0 . Our other textures can only do dark colors .