If youÔÇÖre looking for something a little stronger and more permanent than the Magnetic Adhesive strips the LED Metal clips offer the ideal alternative. Within each pack there are 4 metal clips and 4 self-tapping screws ideal for screwing into a standard melamine terrarium. It is recommended to use one clip per LED strip for standard terrariums; however if you have large arboreal snakes or lizards using 2 clips per strip will offer added strength and security.