Specifications: Smooth writing. Clean drawing lines Package Size: W2.0 x D5.4 x H0.7 inches (W51 x D138 x H18 mm); Package Weight: 0.6 oz (18 g); Ball Diameter: 0.03 inches (0.7 mm); SS-1005 MSE-500BS MSE-3050EX MSE-100EX SD-253KTS