- Brand: COREFIT - Product Name: BODY DRIVER - Accessories: Instruction manual/warranty card, box Retail price: 59,800 yen (tax included) This listing is for the BODY DRIVER only. The warranty card is included, but the warranty period has expired. As stated in the instruction manual, you may not feel the pressure during continuous use, but it will return to normal after a few uses. Due to the double spring hammer structure, it seems inevitable that there will be no impact sound or pressure.