Bought some LED strip lights and it came with two rolls of this, the instructions say nothing about it, it is sticky on both sides and appears to be the same length
China Factory SMD LED Strip Lamp 120V AC Single Color Super Bright LED Strip Lights 18mm IP65 High Power Flexible Indoor LED Strip Lighting - China SMD LED Strip Light, SMD LED
Xt-265 aluminum profile - visible - LED strip duct - Lights and more