5.?Updated Weft Size & Improved Weft Radian?-- Our weft’s width which is 10.9inch is made according to measure head circumference. Our wire hair lace net is curved design, this will not cause discomfort caused by the contact between the ears and the lace mesh. 4.?Specification and Recommendation?-- 12'':70g,14'': 75g, 16''-18'': 95g, 20'': 110g. If you have thin hair, suggest 1-2 sets to add length, 2-3 sets to add weight. If you have thick hair, suggest 1-2 sets to add weight, 2-3 sets to add length. Wire hair extensions are not suitable for people with very fine hair on the top or baldness as the wire may not be well hidden. How to care and wear: please refer to the detailed description. 3.?Stable Weft - Double Fixed & Replacement Fish Line?-- Double fixed with 1 fish line which is 23.5cm and 4 clips make doores Wire hair extensions more stable and secure. If you don't need the clips, you can remove them and use the wires. We put 3 more wires (18.5cm, 20.5cm, 25.5cm) and 2 clips in the package for replacement. 2.?The Easiest and Quickest Installation Way - Add Hair Volume Only in 5 Minutes?-- With the adjustable wire, Doores Wire hair extensions can achieve the fastest installation. Even a novice can do it. Suitable for daily work and rush appointments. 1.?100% Human Hair Extensions - 9A Salon Quality?-- No tape or chemicals to injure your hair, with hidden transparent wire, can blend perfectly with your hair color. No tangle, no shedding, silky straight and soft. Wire hair extensions real human hair can be washed, strengthened, curled, dyed, permed etc.