Size: The dimension of case is about 10.5*7*4.3cm, easy to carry and storage.Material: The precision calibration weight set are made of high quality steel chrome, not rust and durable.Portable: The precision calibration weight set will come with a tweezer, make it more convenient when picking calibration weight.Quantity: 1 x 100g,1 x 50g, 2 x 20g, 1 x 10g, 1 x 5g, 2x2g, 1x 1g, 1x500mg, 2x200mg, 1 x 100mg, 1 x 50mg, 2 x 20mg, 1 x 10mgWidely application: Perfect for digital jewellery scale, general laboratory, commercial and educational, digital pocket scale, jewelry carat scale, diamond scale, precision balance test, etc.Specification: Item: Precision Calibration WeightColor: Silver Quantity: 17pcs Material: 45 steel Model: 10mg-100gvPermissible Error: +/- 0.003g Package included: 1 x Tweezer 1 x Plastic Storage Case