Thickness: 2~2.5mm Color: G001 / G002 / G003 / G004 / G005 (Optional) Item: Glow in the Dark Polyester Luminous Yarn. Length: Approx. 50 meters Weight: 50g/roll (±5g error) Composition: 100% Polyester 100% Polyester Fiber: Not easy to break, and soft. Different colors of lines will emit different lights. Please choose according to your needs. The luminous effect depends on the ultraviolet ray. When placed in the sun, the product can fully absorb the light. After absorbing the light, it will emit light for about 6 hours. It can be used to make hats, scarves, etc., or add interesting decorations to clothes to make your items look cool. At the same time, we can make friendship bracelets, handicrafts, iron art, tassels, children's DIY projects, children's handicrafts, and so on as gifts. Package Included: 1 Roll x Luminous Yarn Note: Please allow 1-10cm size error due to manual measurement. Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same.