TECSEE Jadeite switches housing feature a UHMWPE top housing and Polycarbonate (PC) bottom housing. Very smooth linear switches with 63.5g two-stage, 22mm long springs. The switches also utilize a UHMWPE stem for a more smooth and solid bottom out sound with very lightly lubed and while they are ready to go on any mechanical keyboard, those inclined to tune their switches will find an excellent starting point.