The Haemolance Lancets easily obtain blood samples without distracting the patient with a visible needle. To use the Haemolance Lancets just twist off the protective cap and puncture the skin. The lancets have a 1.8 mm needle depth. Haemolance Lancets come in two gauges: 21G and 25G. The lancets are packaged 50 per box and 150 per box.