I received this as unused, but I have no plans to use it, so I'm putting it up for sale. Since I can't confirm it's unused, I've selected "Like New." - Set Contents: Glass pen, invisible ink, UV light, pen rest - Color: Black - Glass pen size: 18cm long - Ink bottle size: 2.3cm x 4.5cm - Pen nib size: 1cm x 4.5cm The following is information found online: 【Unique Design & Highly Practical Set】 The ESSSHOP glass pen is a set of 1 glass dip pen and 1 invisible ink. It is made of high-quality crystal glass with heat and water resistance. You can feel the smooth and cool body in your hand. It is a handmade modern craft with high borosilicate glass, a delicate grooved nib, and various shapes for adults and children to easily grip the ink pen. 【Invisible Ink & Mysterious and Unique】 With invisible ink, the written content will appear immediately when illuminated with the included UV light. It is very mysterious and romantic. It is a pen suitable for all kinds of ink colors. 【Smooth Writing】 The nib of the ESSSHOP glass pen is designed to enhance ink adhesion, allowing the ink to flow along the grooves for smooth writing. When dipped in ink, you can write about 40-60 words. The nib can be easily washed with water. You can quickly switch between different colors without refilling the pen. Note: Other colored inks need to be purchased separately. 【Smooth and Versatile】 This glass pen with a straight grooved nib ensures a smooth ink flow for smooth writing and is suitable for writing short essays, signing guest books, drawing and sketching, hand lettering, and practicing calligraphy. It is useful for yourself and as a gift for children and friends. Recommended for weddings, parties, and other signatures with its beautiful and unique design. Thank you for viewing. #glasspen #invisibleink #glasspenset #ESSSHOP