Bull Worker XO Hard Type Solid is a very stable product, "Bull Worker. Fukuhatsu Metal Co., Ltd. (formerly known as Fukushima Hatsujo Seisakusho), which has been manufacturing Bull Workers for 50 years, has experienced staff who know everything about Bull Workers, and staff who have adopted new technology. Each part is manufactured using new technology, paying attention to every detail. This was completed after a thorough review. By reviewing the sliding resistance, the overall length has been reduced by 20mm compared to the X5, and the spring diameter has also been changed. The center pipe uses an eco-friendly electrodeposition coating. The paint color is neo black, which gives it a profound feel. The logo design has been completely redesigned, with a design that strongly expresses the letters XO and a dynamic design that evokes the image of muscles in the background. Please note: Training DVD is sold separately. BULLWORKER is a registered trademark Product specifications BULLWORKER Steel wire Grip part: 6 nylon Belt part: Tetron (Tetron is a registered trademark of Toray and Teijin) Accessories: Wall chart, manual, warranty Country of origin: Japan Manufacturer: Fukuhatsu Metal Co., Ltd. Product number: FB-2216 JAN code: 4948973622163 Manufacturer: Fukuhatsu Metal Co., Ltd. Present details Mini worker Size: (approx.) 15 x 25 x 130 mm Weight: (approx.) 90 g Main material: Steel pipe, brass, die-cast , hard steel wire 60C, silicone rubber Country of origin: Japan Manufacturer: Fukuhatsu Metal Co., Ltd. Product number: FB-2216 JAN code: 4948973622163 Finger motion Size: Width approx. 82mm Height approx. 94mm Weight: Approx. 45g Main material: Hard Steel wire, silicone rubber Product number: PIO-1571 JAN code: 4948973915715 Isometric trainer Professor Morpurgo (University of Siena, Italy) Strength and Volume announced that the increase would result from the development of existing muscles rather than from the formation of new muscles. Bullworker inventor Gert F. Koerbel has created an isometric trainer that covers all major muscle groups and can be used for both contraction and expansion movements. Over the years since its launch in 1963, Gert F. Koerbel continued to improve both the exercise equipment itself and the training programs.