The MTX Performance Rear Solid Round Brake Disc - Kawasaki GPX250 Ninja 1988-96 is part of the latest performance brake disc range from MTX.Drawing from its immense racing experience, MTX has refined the performance and tolerances now offering applications for almost every motorcycle brand and model on the market.. Performance at your fingertips!Solid disc features: Constructed using one complete segment of Japanese SUS 420 stainless steel, then heat-treated to HRC 36+-2 standards.. Lightening and drill hole patterns are applied as per OEM specifications to improve braking performance and reduce the discs temperature during use.. Precision CNC machined and laser cut technology. Japanese SUS 420 Stainless Steel. Replacement for Original Equipment. OEM Design; lightening & drill hole patterns. Technical spec.: Outer Diameter (mm): 230. Inner Diameter (mm): 110. Bolt Hole Circumference (mm): 130. Bolt Hole Quantity: 4. Bolt Hole Size (mm): 10.5. Thickness (mm): 5. Minimum Thickness (mm): 4.5. Bolt Hole Type: Counterbored. Manufacturer Part Code Cross Reference:EBC MD4042. Manufacturer part number: MDS03006