Review (1/5): One time use.  NOT reusable.
Problem #1- I bought these because they are stated to be reusable. I assure you that they are NOT. The attached microbead is literally glued onto the extension, so you cant even use a new microbead. Whenever you install these (mine were installed by a professional), the attached beads crush, so they CANNOT be moved up (nor replaced with a new bead as the other is glued on).
Problem #2- Due to the way these are made (Your hair is pulled through a smooth tube and the microbead clamps over it), they slide right out of your hair with the slightest bit of pressure. On the first night I had 56 extensions loose and sliding out. I then had to go pay to have another box installed. FIFTY SIX.
Problem #3- the ends of the extension (closest to your scalp) are frayed edges. Instead of being keratin bonded and smooth, they are like little brooms of sharp hairs that constantly itch your scalp. I mean, insanely uncomfortable.
I attempted to contact the seller. She stated she would send me a new pack of beads to try. She never sent them. It wouldn't have mattered anyway because she has clearly never seen the product or she would realize that you can't use a new microbead with these as here is literally no way to get the old, broken bead off.
These were purchased for approximately $325. I spent another $300 to have them installed. $625 to have them in for less than a week. If you want to spend over $600 for a week of slipping extensions, then these are for you.