Thank you for viewing! ★Product Name Transistor Technology 24-book set Retro magazine, rare, scarce Semiconductor, OP amp, circuit design, microcomputer design PC, analog circuits These are not ex-rental or from a manga cafe. Since these are used, please refrain from purchasing if you are looking for a perfect product. Also, there may be folds, stains, or scratches due to insufficient inspection. Please understand. Lightly cleaned. (The covers have been cleaned with alcohol disinfectant.) *This does not apply to books with paper covers or those where the alcohol solution would soak in. We cannot accommodate requests for individual sales, dedicated listings, or holds, so please be aware of this. ★Shipping Method We plan to use anonymous shipping. The shipping company may be changed without notice. Immediate purchase without comments is welcome. Even if there is a conversation in the comments, the person who purchases immediately will be given priority. Please take a look at my other listings as well. #KarasimonBooks