Made of corrosion-resistant materials to extend the product's service life The sponge is excellent with ink absorption Able to clean printhead effectively, increase the printhead service life Compatible with Roland FH-740 / RA-640 / RE-640 / VS-640 / VS-540 / VS-420 / VS-300 / BN-20 / XF-640 / RF-640 We act on the principle of customer first, we hope that customers buy our products and at the same time can be happy to buy such a useful product, if you find that you are dissatisfied with the use of our products, you are welcome to refund or contact us at any time, we will be sure to actively solve the problems you encountered! Compatible with Roland FH-740 / RA-640 / RE-640 / VS-640 / VS-540 / VS-420 / VS-300 / BN-20 / XF-640 / RF-640.