Uxcell Magnetic Stainless Steel Floating Ball， 28 mm x 28 mm x 9.5 mm<img src="http://ecx.images-amazon.com/images/I/41i-bKyJ0YL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31p%2Be%2BzY6QL.jpg" noproxy>