The versatile Speed Gobo is made of a tough black ballistic nylon on one side and a white polymer on the other. The black side can be used to keep light from flaring into your lens when using your flash as a background or hair light. The white side can be used as a bounce card. Buy two for a great barn door setup. The Honl Speed Gobo attaches quickly with a Speed Strap (available separately). 4" x 7.5" (approx. 102mm x 191mm).