COB width: 10mm/ 8mm/ 5mm/ 3mm. Smallest cut unit: 21/41.66mm(3mm or 5mm PCB), 25/50mm(8mm PCB), 46mm(10mm PCB). LEDs quantity: 384LEDs/m (3mm and 5mm), 480LEDs/m (8mm), 528LEDs/m (10mm). 384leds/m-5mm, the specification has now been upgraded to 400leds/m-5mm, its cutting unit changed to: 12V-10mm, 24V-20mm, after you order now, what you get will be the upgraded version!