We confirm the size and individually design the length and thickness, so for 4-string JB types, including Fender, AtelierZ, History, Sadowsky, etc., we can deliver a compatible product in most cases (^^) Although not widely recognized even by manufacturers, this part often becomes unusable if the thickness is not individually adjusted. For 5-string basses or those with layouts clearly different from typical JBs, separate arrangements will be made. If you are concerned, please contact us first with the model number (prices may also vary). This is because if it is equipped with a pickup with a unique standard, it will not fit our 4-string layout. <Other Specifications> - Equipped with screw protection and can be easily attached with the included double-sided tape! - The top surface shape can be flat or arched according to string height (for semi-custom orders, we apply a suitable arch from a standard mold). - Depending on the design, a rest for placing the thumb has been added as shown in the second image. (It is not added if it is deemed unnecessary. Please consult us in advance if you have a preference regarding its addition.) - We also provide adjustment guidance for those who are unsure about the adjustment status of their instrument. (There are very few people (including instrument shops) who have proper knowledge of bass adjustment...!) - We offer an exchange service for 300 yen including round-trip shipping if the fit is not satisfactory due to customer measurements or individual style differences (^^) We also offer slight discounts for bulk purchases, so please consider it. We also accept custom orders for various shapes and string height tracking designs. We propose designs tailored to your playing style, so please feel free to contact us.