Material: ABS<br> Color: Black<br> Size: 9*7.1inch/23*18cm<br> Suitable for No.4~No.7 ball<br><br> <b>Drill-free Installation Method</b><br> After the trace-free patch is attached to the all surface, press it to extrude air, and fix the ball holder with the No.1 screw. It is recommended to use it after placement for 24 hours. It is note recommended to use on the painted wall.<br> Wood or plastic wall surfaces do not need to drill holes, and not need for screw seat patch, directly use No.2 srew to fix the ball holder.<br><br> <b>Drilling Installation Method</b><br> On the cement or brick wall surface, drill two holes corresponding to ball holder, drive into the rubber plug, and then fix the ball holder with the No.2 screw.