The Radar S-10000 measures 276 x 141 x 43 mm and weighs over 2.2 kilograms (5 pounds), making it one of the largest, if not the largest, commercially available erasers.

Japanese eraser maker Seed was founded in 1915, making it one of the oldest companies in the business. Its most popular product line, Radar, was launched in 1968 and quickly became a favorite in the Japanese market. The smooth texture and flawless erasing performance made the Radar a commercial success despite its premium price range of 20 – 50 yen, at a time when 10 yen erasers were the norm. The Radar line has been going strong ever since, with erasers of various shapes and sizes, including a gigantic 2,285-gram slab priced at an eye-watering 13,200 yen ($100).

The Radar S-10000 is the largest eraser in the Radar line, and probably the largest in the world. Weighing a whopping 2,285 grams, it is 200 times heavier than the standard Radar S-60 eraser. However, they are both made of the exact same material, so the erasing performance is exactly the same.

So why make such a large eraser? After all, it’s not like anyone actually needs such a product. According to a source at Seed’s product development department, it all started as an idea for an original giveaway. Seed already had two large eraser models – the S-1000 (130 x 66 x 27 mm) and the S-JUMBO (160 x 75 x 27 mm) – and they decided to make something even bigger.

The very first Radar S-10000 was supposed to be a one-off, a prize for the company’s annual “Eraser Quick Eraser Contest” held at its flagship store. However, the prize was so well received by fans that Seed decided to turn it into a commercially-available product.

Apparently, making such a large slab has its challenges, as heating the material in such a thick layer is a little tricky, but Seed made it work, and the company guarantees that the S-10000 is just as efficient as its smaller Radar products.

The S-10000 eraser has been around for a while, but it recently went viral in Japan, after someone posted pictures of it on Twitter. The company actually thanked them for raising awareness about the product.

If you’re interested in owning a 5-pound eraser, the S-10000 is available online at a recommended price of 13,200 yen ($100).