Springs are sold in packs of 110. The TX Magnetic Springs are recognized for their strict adherence to quality control standards, ensuring the production of uniform and top-notch springs for switches. The TX Magnetic Springs—designed exclusively for magnetic switches and not compatible with MX-style mechanical switches. TX Magnetic Springs comes with 2 different sizes: Medium – 18mm: Offers a balanced, responsive press with a clean return.Long – 20mm: More progressive force per each press with faster return. Specs: Cherry MX HE compatible Springs have been QC'd to have less than +/- 1 deviation Lengths: Medium (15mm), Long (16mm) Bottom Out Force 45g, 50g, 55g, 60g, 65g, 70g Pack of 110 * We recommend that you lubricate the springs with Krytox 105 or Krytox 106 prior to use. Please note: this item is final sale. No returns or refunds will be accepted.