Swiss precision craftsmanship-smart glasses seven years pen

""A pen that is said to last seven years"" Environmental protection country Swiss precision craftsmanship design and manufacture, Each pen contains a lot of ink, The pen contains enough ink to write a continuous line 4 to 5 kilometers long, We did some mathematical calculations (write 1 to 2 meters of ink every day, multiply by 365 days, multiply by seven years) And came up with the title: "Seven Years of Pen". It can be used for up to 7 years when writing 1.7 meters per day. Super durable nib and smooth writing pure black ink Design and ecology coexist, a pen that changes the world The 7 Year Pen can be refilled. , You don’t have to throw away the entire pen when the ink runs out.