The Vivitar WFK-2 Flash Wide-Angle Flash Filter Kit in multiple colours is a rectangular filter kit designed for Vivitar flashes. The kit includes instruction/information leaflet and filters in different colours that can be easily attached to the flash using a drop-in mount fitting. The filter size is 52mm, making it compatible with a range of Vivitar flash models. This kit allows photographers to creatively enhance the light and colour of their flashes to achieve different effects in their photography.