The roller has a lubrication groove to disperse lubrication over a long time. Long life, low noise, cold temperature as low as -45 Celsius5. Reduces garage noise with precision ball bearing and nylon casters are much quieter than stock garage casters. Applies to: Automatic garage door , arch garage door, solid wood garage door, anti-pinch garage door, cellular garage door, engineered garage door, remote garage door, villa garage door 11.5 x 4 .5cm/4.53 x 1.77in (LxDia) Weight: 534g Package Contents: 4 Garage Door Rollers.