PU Hole Flat Weft Hair Extensions, or Butterfly Weft Extensions, enhance the ultra-thin design of Genius Wefts. They have a double-sided design: one side features smooth, machine-inserted wefts that mimic natural hair growth for an undetectable appearance, while the other side has a perforated PU design that is ultra-thin and lightweight, ensuring comfort and seamless blending with natural hair. This blend of comfort and durability makes them a popular choice for achieving perfect volume. Product Details TYPE: Weft Hair Extensions (100% Virgin Human Hair) COLOR: Photographed from the actual product, but the color may vary slightly due to lighting, angle, and monitor settings. WEIGHT: 50g / bundle, 100-150g for a full head LENGTH: 16"-24" SETTING: Can be washed, dyed, cut, styled and curled TEXTURE:Natural straight, with a natural wave when wet or left to air dry or diffused. LIFESPAN: 6-12 months Note: This product is a pre-sale item and requires 10-15 working days of production time. Once an order is placed, it cannot be canceled if not canceled within 24 hours, as production will have already begun. Additionally, pre-sale products are not eligible for return or exchange, thank you for your understanding. How many packs do I need? Minimum 2-3 packs Medium Hair 4-5 packs Thick Hair 6-7 packs Note: This product is a pre-sale item and requires approximately 15 business days for customization. If you need it urgently, we can contact the factory to check the earliest delivery time. We will initiate production 24 hours after your order is placed, and orders cannot be canceled once production starts. Additionally, pre-sale items are non-returnable and non-exchangeable. Thank you for your understanding.