MaterialStainless steel spike Plastic pigeon control spike Spike Length500MM Spike Quantity36PCS Base length500MM Packing100PCS/CTN Packing sizes55*54*33CM Bird Spikes are produced from the highest quality UV resistant GE produced plastic and the spikes themselves are made from premium grade stainless steel. The spikes can be installed onto window sills, ledges, pipes,fences and other surfaces nuisance birds typically land on.