For those who prioritize peace of mind over price The shape of the refill top (black part) is also a compatible product that is almost the same as the genuine product. There is no need to worry about the snagging that occurs with some ballpoint pens, or other problems. The writing feel is smooth and it is a very cost-effective refill. Please try it once. 【Product Name】 Compatible Cross Ballpoint Pen Refill Tip Ballpoint pen (oil-based) Ink Color Black M Medium (0.7mm) Quantity 5 Price 798 yen ・No discounts ・Blue and red colors can be changed and combined ・Ink color changes cannot be made after the product has been shipped ・Please consult before purchasing 【Compatible Refills】 CROSS 8101, 8513, 8514, 8100, 8511, 8512 Blue 8515 and others 【Please Read】 Compatible products often have the resin ball that protects the rigid ball of the pen tip, which is the life of the ballpoint pen, removed or not attached at all to prevent ink deterioration. I think everyone has had the experience of "I still have ink left, but I can't write at all." Compatible products do not have an expiration date (each brand is generally about 2 years). It is unknown how much time has passed from manufacture to arrival, and the causes of ink defects are diverse, including storage conditions, so we inspect the products and send those that have not had the resin ball removed in order to minimize the situation where you can't write when you try to use the last 5th refill. Please search the internet for "ballpoint pen refill expiration date" for a guide to the ink expiration date. 【Returns Accepted】 We accept returns, including cases where you have made a mistake in your purchase. However, the buyer is responsible for the shipping costs for returns (110 yen for postage stamps). *The seller bears the shipping costs. Very rarely, 1/5 of the compatible products are asked for quality that exceeds expectations, such as "How much ink is there?" or "How many mm is the pen tip core?" However, it is not beneficial for either party, so please refrain from purchasing. We are pleased to have ordinary people who understand the above content. 【About Shipping】 Please be sure to read the profile before purchasing, as it is stated there. Cross Ballpoint Pen Refill Replacement Core