Features: Made of high light transmission material with steady color temperature and low loss, fitted for photo studio strobe, flash lights and LED lights. Can be used for lighting effects and color correction, involved in adding, subtracting and mixing the colors of light, creating amazing lighting effect. Size30 * 21cm/ 12 * 8.3in is big enough to cover flash heads, compatible with most of the light in the market. Different color gel sheets have various usages, bring you different visual experiences. These gel light filters are protected by coverings on the both sides of filters, so don't worry about being scratched. Specifications: Material: Plastic Quantity: 7 * 2pcs/ 9 * 2pcs(optional) Product Dimension:30 * 21cm/ 12 * 8.3in Note Not heat resistant so please make sure the light source is cool. Ensure the light temperature below 80 Celsius Degree. Package List: 18 * Gel Filters