20" & 22" hair lengths.
This hand-stitched u-part unit is recommended for head circumference 22 " - 23 ". Some space in the back of the unit is likely.
Lace closure will need to be replaced depending on the wear and tear. Hair bundles last 2 years plus with the proper care. 
Mink Brazilian extensions will range between colors 1b - 2. 
The opening of the unit is 2" in width and 4" in length. There is a built-in elastic strap with clip-in combs to secure the unit. 
This unit ships in its natural wavy pattern. Minimal hair products are used on the unit.
This unit is recommended for individuals with healthy edges and leave out. Please consult with your hairstylist to determine your hair health.