HDHalo Technology. These HD LED semi-flex strips have been designed from the ground-up to be absolutely the brightest, most reliable strips physically possible. Each strip is populated with a large number of high-density (HD) LEDs, which are then coated by a diffusing gel, resulting in a perfectly uniform light when turned on. When off, the diffusing gel hides the chips, resulting in a clean, OEM appearance. Sizing:All sizes are listed by total length, in millimeters. Strips can be shortened by up to 20%, but no less! Width is 8mm, and total height is 4.5mm. Mounting: The strips must be custom-mounted in position using adhesive or beading wire using the integrated mounting tabs. If you wish, mounting tabs may be removed with a pair of clippers or basic sanding. The strips can be modified if needed to fit certain applications. Up to 20% of the strip can be removed using side-cutting snips and still remain fully functional. Click here to learn more: Cutting HD Halos and Strip video.