• The back blister paper is easy to open
• Accurate Slot design fits 99% of pen machines
• The membrane inside is not easy to pull apart
• Membrane with 4 Thickened Bars，more durable
• Soft and Strong Flexibility Membrane Material
• Soldering material is better than the other brands
• All the needles with CE certificate sterilized by EO GAS
• Needles are more sharp and neat under the microscope
• Medical PC Material for the shell better than the other brands with PVC Material