Stem: POM with extension spring Housing: PC Bottom: PC Type: Linear End Force: 55gf 5gf Total Travel: 3.30 mm Pre-Travel: 2.0 0.5mm Tactile Position:N/A Tactile Force:N/A Compatible with most mechanical keyboards with 5-pins hot-swappable socket Fitted with hot-swap socket types including for Outemu, Kailh and Good replacement switches for Cherry, Kailh, , and switches Approximate lifespan of 60 million times of keystrokes based on the laboratory durability test Equipped with LED slot ready for LED Mod/Assembly, and are SMD compatible (LED underneath the switch) Come with MX style structure so would fit most keycap sets with (X) stem Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Colour:Black Material:POM+PC Package Contents: 45x Keyboard Switch Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.