Specification: 100mm x 45mm x 50mm or 4 inch x 1.8 inch x 2 inch; 5/16 inch (M8) bolt size; Weight: 0.4kg. Max load: 50kg (110lbs); The recommended distance between each two isolators is 24 inches, for example, 63 to 99 isolators are needed for a room area of 215 to 322 sq ft. Easy to install: The base has one bolt hole for rigid mounting when used for supporting machinery, allowing easy installation on ceilings, floors, walls, ducts, etc. Wide application: The shock absorber can be used in bedrooms, studios, home theaters, houses, hotels, bars, and karaoke rooms. Can be mounted to ceilings, walls, and pumps. Color: Black + Red. Material: Plastic + Metal. Package contents: 4 x Spring Vibration Isolators. Only the items listed above are included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to vary slightly from the actual product. Measurement may vary by +/- 1-3cm.