Thank you for viewing. ■ Please purchase only if you understand that this item is non-refundable and non-returnable. ■ Please refrain from purchasing if you are nervous about the condition. ■ Please judge the condition of the product from the images and make your purchase. ■ We do not accept cancellations, returns, or refunds after purchase for any reason. 《Product Details》 ● Sold by the High-Pressure Gas Safety Institute ● High-Pressure Gas Manufacturing Safety Manager, Class B ● 7-piece set of text and problem books ● This is a set that was originally sold for 22,240 yen, now offered for 17,800 yen. ● Purchased new and unused.