These MX-compatible springs are made from a special material and produce almost no ping noise even without lubrication.
1 Pack = 110+5 Springs
Material: NI-BR 0.30
Free Length: 19 mm (±0.02)
Coil Diameter: 4.00 mm (±0.05 mm)
Spring wire diameter: 0.23 mm
Bottom-out weights: 42.5 g, 52.5 g
Brand: GEONWORKS / Manufactured in South Korea