These are like placeable SHREDR spikes, with 19 extra spikes added extra, giving it 30 pops to normal bloons, and 90 damage to MOAB-class. Explode with extreme power when used up. Cost 150$ each pile. They do NOT replace Normal Spikes, but only because they are a bit expensive.
You get them by beating CCBoTD with 1 or more health to spare on the temple.