[Powerful Magnetic]: The stud detector does not require battery power and is manufactured with magnets that generate 27 pounds of magnetic force. It can detect metal through 1/2 inch or 3/4 inch drywall and other thick building materials. Works through ceramic tiling and up to 3/4 inch plywood paneling. [Quick & Accurate Metal Stud Finder]: The magnetic stud ball can locate studs and any iron-based materials. It can be used to retrieve screws, sewing needles, keys, and other small iron objects that fall into narrow gaps. [Compact and Portable]: This stud finder is small and portable, with a diameter of approximately 0.78 inch and a length of about 2.59 inches, making it easy to carry. Ideal for decorators, contractors, and DIY enthusiasts who need to find hidden studs. [Works for Most Scenarios]: Detects metal studs in various construction materials including carpet floors (3/4 inch), plaster walls (3/4 inch), concrete walls (5/8 inch), ceramic tiling (3/4 inch), plywood paneling (3/4 inch), and wood frame walls (5/8 inch). Color: Black Material: Silicone + Metal Package Contents: 3 Pcs Stud Ball Magnetic Stud Finder Note: Light reflection and different display settings may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.