The york commercial 2 x 15kg 33lbs rubber hex dumbbells incorporate rubber coated heads to ensure safety for surrounding objects and flooring their heads are torque threaded to provide permanent fixing to the thick 35mm solid steel shaft while the anti roll safety design stops them from rolling away between series of exercises the dumbbells also feature chrome plated knurled steel handles for a secure and comfortable grip they are perfect for performing biceps curls lateral or frontal