Clear Gem Black Acrylic 2 Piece Screw Tunnel - These 2-piece tunnels are gorgeous with clear crystals for a bit of bling. The gems around the front rim are sunken into lightweight black acrylic. These won't feel heavy in your ears and the screw backs mean that they can be changed with ease. Its important to screw the backs on gently and not to over tighten as may damage the back piece.