“ASR Tactical Ninja Road Stars | Tire Puncturing Security Caltrop Devices Constructed From Heavy Gauge 5/16" Hardened Round Steel, Each Unit has Four 2" Long Spikes” Sold in packs of 4, 12 and 24, with a “Bonus Flameless Flare LED Emegency (sic) Beacon” on Amazon.com in the USA. Originally sourced in 2014, re-listed in 2015.