Features: The tip of the bottle is easy to add ink-, the color of the lid is the same as the color of the ink, the color is bright, and there are multiple colors- to choose from. How to use: When marker is about to dry, open the- marker, take out the refill inside, stand up the refill, cut off the cover of the ink, add ink- to it, be careful not to add too much, just an appropriate amount, (the tip is dry No more ink can be added to markers and markers with dry cores.) Highly saturated, versatile, fast-drying. Pigments may settle, shake metallic inks well before using. Great for beginners and professionals. Specifications: Material: Plastic Bottle Capacity:200ml Size: Approx.4x17cm/1.57x6.69inch Color: 10 Kinds Optional Package Includes: 1x Marker Pen Ink (200ML) note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color of the item.