Birdie Media's aluminum sport spikes are attractive signs for promoting athletic abilities or sports of choice. The built-in base spike makes it simple to set up and sink into the lawn. The rigid sport spikes are 1/8 (3mm) Dibond and constructed with two (2) thin aluminum sheets sandwiching a black solid plastic core. Dibond is both rustproof and waterproof making it an excellent choice for outdoor use. Sports spikes are customized to include the athlete’s name, position, number, school/athletic league’s name & mascot, and color palette.