Pony UV Sunlite; Purple 100g (approx 380p). Inside measurement 4mm. Premium quality fun type off white pony beads which instantly change colour in sunlight (available in 5 colours). They revert back to off white when away from UV rays. A fun way for children to learn colours. Great way to add extra dimension to a beaded project. Bead size 9mm , hole size 3mm.