Details 1.This link is only the shaft and switches for mechanical keyboard 2.It can only be used with SMD led,can't use switch led.All box switches in our stock are new edition,won't break GMK keycap. It can be compatible with 2x3x4mm led and 1.8mm led,however need to solder led to PCB at first,then solder switches on.3mm round can't use even you solder led before switches. 3.The life-time is around 80 million times which is longer than usual switches. 4.This switch is IP56 water-proof and dirt-proof.Kailh Box switches are IP56 rated to keep dust and moisture out. Created with a box around the cross stem instead of the cross stem just sticking up, they're built to avoid corrosion and debris buildup. The box extends to the contact plate and leaf, providing extra protection. 5..Used 18k gold crosspoint technology which makes press feeling better. Box Black Linear Operating force: 60 gf (+/-10 gf) Pretravel: 1.8 mm (+/- 0.3 mm) Total travel: 3.6 mm (+/- 0.3 mm) Reset point: 1.8 mm Box White Clicky Operating force: 50 gf (+/-10 gf) Tactile force: 55 gf (+/-10 gf) Pretravel: 1.8 mm (+/- 0.3 mm) Pressure point: 1.7 mm Total travel: 3.6 mm (+/- 0.3 mm) Reset point: 1.8 mm Box Brown Tactile Operating force: 50 gf (+/-10 gf) Tactile force: 60gf (+/-10 gf) Pretravel: 1.8 mm (+/- 0.3 mm) Pressure point: 0.6 mm Total travel: 3.6mm (+/- 0.3 mm) Reset point: 1.8 mm Box Red Linear Operating force: 45 gf (+/-10 gf) Pretravel: 1.8 mm (+/- 0.3 mm) Total travel: 3.6 mm (+/- 0.3 mm) Reset point: 1.8 mm