x-haibei 1 boat fender ball round anchor buoy, dock bumper ball inflatable vinyl shield protection marine mooring buoy blue, a29(d11.8h13.8 inch) x-haibei boat balls are a great alternative to regular fenders when tying your boat up to other boats or the dock. they are easy to inflate by mouth or with a hand pump and then they easily deflate to store. so if you plan to have a good time in party cove you better get a pair!<br> it is about 20lb if the a25 ball is full filled with the wather and 30lb if a29 ball is full filled with wather. <p>1.in order to save freight for clients,we will deflate the pvc boat fenders /buoys.so the clients need to inflate it after received. we will give special inflating needles <p> 2.insert the inflating needles into the centre hole of the valve.if it is difficult to insert the inflating needles,do not force to .you can change the angle and try again. <p> 3.please do not inflate too much air,because when in summer,the weather will be hot,and the air will expand.so it is better to reserve some space for it. use your finger to press the surface,it can down a little easily,then it is ok. the recommend inflation is 2 psi, about 0.013mpa.