High Elastic Spring: The High Elastic Steel Spring Allows You To Quickly Restore The Original Position Every Time You Hit The Boxing Ball Without Hurting You. Durable Speed Ball: This Boxing Bag Is Made Of Resilient Pu Leather Material With Internal Inflation. It Can Withstand Multiple Hits Without Deformation. Easy To Install: The Wall Suction Cup Is Fixed, And Can Be Installed Soon. This Boxing Ball Will Hardly Occupy Your Place In The Home. It Only Needs To Be Installed On The Wall In A Small Place.