The product in the image is the Frixion Ball 4 Wood (Dark Green), model number: LKFB-3SEF-DG. This model is a high-end version of the Frixion series, which features erasable ink. Its main characteristic is the use of birch wood for the grip. ◎ Please note that this item has been stored at home, so the packaging may have minor scratches or scuffs. However, the product itself is in new, unopened condition. ◆ Key Features 4-color multi-pen: Allows you to use black, red, blue, and green ink with a single pen. Fine tip: The 0.5mm extra-fine tip is suitable for detailed writing in planners, documents, etc. Sophisticated design: The chic design combines a wood grain grip with black metal parts, making it easy to use in business settings. Erasable function: The ink can be made colorless by rubbing it with the dedicated rubber eraser on the back of the pen shaft due to friction heat. ◆ Usage Notes Not for official documents or addressing envelopes: The ink disappears at temperatures above 60°C, so it cannot be used for official documents. Restoration: The erased ink may reappear if placed in an environment of around -10°C (such as a freezer). ◆ Refill Information The following refill models are compatible: Black, Red, Blue: LFBTRF30EF3 Green: LFBTRF12EF-G