"Please Stay Off Grass" Sign for Lawn by SmartSign | 9" x 12" Aluminum Sign with 3' Stake DURABLE ALUMINUM. 12" x 9" sign is made of heavy-duty 63 mil thick aluminum and attached to a 3' tall stake. Signs outlast plastic signs, which can be torn off more easily. THIS SIGN GETS RESULTS. With 100's of satisfied customers, we know that this sign has made a difference. A clear sign leaves little to chance. STURDY STAKE INCLUDED. Unlike cheaper stake signs, these signs feature a bend-proof steel stake with an enamel coating. Compare to extruded aluminum stakes from competitors, which bend easily. INSTALLATION. Easy to insert into the ground, with no special tools or strenuous digging required. Just push the 3 tall stake down. For hard packed ground, a hammer can be used.