This rotary cutter comes with a Tungsten blade already attached, and we do sell replacement blades here. The cutter is ideal for fabric, leather, paper, vinyl etc. The retractable blade ensures safety when not in use and we do recommend always using a cutting board in conjunction with the rotary cutter to avoid damage to surfaces. Size (Approx): 140 x 40 mm / 5.5" x 1.58" Blade diameter: 28mm / 1.12"