Nails tips can be inserted into the nail bed without glue about 10 mm, it's stable and more suitable for the thickened nail bed. If you want your nails to not fall off at all, you need to use acrylic / nail glue to stick your tips onto the nail bed.
The Fiona Finger is made of high quality liquid silicone, which is durable and enviromantal, no bad smells and non-toxic, safe for use. It can be re-used for acrylic & gel. Fiona finger can be soaked in the acetone, and they can also be used in the nail lamp.
