Each Chakram is circular and red, with silver spikes and circles around the edges, and two black handles shaped in a cross in the middle. Each Chakram has eight spikes, possibly referencing Axel's rank in the Organization. Axel is very adept in the use of his weapon; he can throw them, use them as shields, or use them as melee weapons. He performs some unique attacks, including juggling them against an opponent, or throwing one across the entire battlefield continuously.
He also uses them in conjunction with his fire abilities, setting the tips or the whole on fire before throwing them. From a scene in Kingdom Hearts Re:Chain of Memories, it is shown that he can set his Chakrams on fire from afar, acting as a remote detonator.
You can download this video game paper model here: Kingdom Hearts - Axel's Chakrams "Eternal Flames" Free Papercraft Download