anti pigeon spikes were put on a partitioning rail (plasterboard) and fixed with cable tie on the railing of the balcony with a length of 05.30 m located on the 4th floor of the residence them being not visible from the street but the only regret is delivered very well packaged parcel control elements 11 receiving 10 .... but at this price ... only product available on Amazon after research and various never disappointed control provided it lasts