We highly recommend to read full description about individual product. Each products have a description online, please check our website. If you are unsure about anything, please contact us. Would be easy for us to help you, if you can describe what particular product you need additional information. We also offer different courses, if you would like to learn more about adhesives, different stylings, what extensions most suitable for Volume etc , please visit our courses information https://puella.si/tecaji-podaljsevanja-trepalnic/ .