Details of hair : Hair Material: Remy Human Hair Tape size: 0.8cm * 4cm Texture: Remy Straight Length: 14inch, 16inch, 18inch, 20inch, 22inch Hair Weight:2.5g Per Piece, 50g Per Package. We recommend 1-2 packs for thick hair, 2-3 packs for thin hair. Quantity: 20 pcs/package Hair Life: 6-12 Months (depending on care and usage) Texture: Straight, Thick from Top to End. How to install tape in hair extensions: Step 1: Use the comb to pick up a thin slice of natural hair as wide as your tape extensions. Step 2: Press the natural hair downward into the tape leaving 1 inch-2 inch space between the scalp and the extension. Step 3: Peel away the second tape and place this piece directly over the first, sandwiching the natural hair in between and seal the tape with a flat iron for maximum adherence. Step 4: Repeat for full head If you are unsure about doing this process at home, we HIGHLY recommend you go to a professional stylist who has been trained to do tape in hair extensions. Warm Tips 1.Remember NOT to wash hair within 48 hours after wearing hair extensions. 2.Take extra time for hair care. 3.They can be colored but not lightened and you can test a small sample when you dye. 4.Hair Can be reused with replace tape. And we suggest to adjust the tape every 4 weeks to keep the hair stay well.