The york commercial 2 x 30kg 66lbs rubber hex dumbbells are made with rubber coated heads that ensure safety for nearby equipment and flooring they are torque threaded to provide permanent fixing to the handles and feature an anti roll safety design that stops them from rolling away between exercises the dumbbells also have chrome plated knurled steel handles that enable more relaxed grip these easy to clean dumbbells are perfect for performing biceps curls lateral or frontal movements