X-Pression - Pre-Stretched Ultraviolet , achieve your glow up braid goals with X-Pression Ultraviolet Pre-Stretched. The 100% Kanekalon tresses has a unique special glow in the dark effect under UV and artificial lighting. Other unique features include pre-Stretched lengths reaching a desirable style, eliminating the hassle of stretching out hair. This makes the entire braiding process quicker and easier – saving you time and money, as one pack comes with two generous bundles.