✓?Application?: Micro beads are suitable for pre bonded Stick/ I tip hair extensions, feather hair extensions, micro ring hair extensions ect. This 4mm silicone lined nano beads only can be used in I tip hair which strands weight is less than 1gr. ✓?Size?: The length of these micro ring beads is 2.0mm, the outer diameter of the hair extension beads measures 4.0mm and the inter diameter measures 2.0mm. Common size fits for most hair extensions. ✓?Quantity?: Package includes 400 pcs micro rings silicone lined for hair extensions, meet your needs of daily hair extension. ✓?Available Colors?: Black, Brown, Blonde, Light Brown, Dark Brown. Please pick the appropriate color accoding to your hair color. ✓?Premium Material?: With high quality aluminium outside and non slip micro silicone lining inside, Vlasy micro nano beads can safely wrap the hair. Protect your natural hair and help prevent the extensions from falliing off.