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A = MR105zz Little size Flat Type Plastic Pulley Concave Idler Gear B = 625zz Flat Type Plastic Pulley Concave Idler Gear C = 625zz V Type Plastic Pulley Concave Idler Gear D = 625zz V Type Stainless Steel Pulley Concave Idler Gear Specifications: Material: Plastic or Stainless Steel Size: four size for your choice, please refer to the product picture With Bearing: Yes Bearing: Mr105zz / 625zz Suitable: 3D Printer Note: *Please allow 1-3CM differs due to manual measurement. Package Included: 1 x Flat/V Type Plastic or Stainless Steel Pulley Concave Idler Gear