For CYhair's Flat-tip hair extensions product, the standard size is 6.0mm x 1.0cm. 1 gram each and a bundle of 100g consists of 100 pieces. Of course, we're able to customize according to your specific requirements. To make the best flat-tip hair extensions, we use only high-quality hair of Vietnamese women. This hair is not only smooth, soft, but also strong enough to color and style. We guarantee to use only Italian keratin to protect your health.