Luxury Single Donor Remy Human Hair Texture: Straight Application: 0.5 – 1.5 hours Lifespan: 1-2 years Amount Needed Thin Hair: 2 to 3 packs (100g to 150g) Medium Hair: 3 to 4 packs (150g to 200g) Thick Hair: 4 to 6 packs (200g to 300g)