One piece is 2cm wide! We often deliver them at 4cm, so please cut them to 2cm and attach them. [52cm, Natural Light Brown] *Level Scale: 5 Tones. Merit Hair: These are our unique clip-in extensions, made with a perfect blend of the highest quality Japanese-made synthetic hair and premium human hair. Regarding Merit Hair: You can use curling irons and straighteners on it, and its quality is very close to human hair, so please rest assured. Over 90% of Remy hair on the market is hybrid. The quality of Remy and hybrid is exactly the same, making it impossible for even professionals to distinguish, but please be careful not to be deceived. Some synthetic hair, especially Chinese-made synthetic hair, can be of very poor quality. Please be aware of this as well. We have received many comments that the color is different from the photo, or that it is brighter or darker than in the photo. Due to the nature of clip-in extensions, they appear differently depending on the time of day, sunlight, and lighting. Quality also varies from person to person, so please purchase at your own risk. On rare occasions, buyers may demand unreasonable returns, but we will not accommodate them under any circumstances. (Please be especially careful if you tend to make impulse purchases during peak seasons.) Some people may threaten us with reasons such as the color being different from what they expected after changing the quantity. Please confirm that you are purchasing at your own risk. No dirt, tears, or odors...