The gravity pucks were presumably created by Leo along with the bounce belt. They were stashed in a secret compartment of Mech-X4. They are capable of producing extreme forces. As shown in Let's End This! Part One, they were capable of holding down a trained security agent. They could also hold down Davage for several seconds before he escaped them. The Markmobile's flying capabilities are capable, because the gravity pucks support the wheels.
The gravity pucks can attach them selves to almost any kind of surface. As shown in Let's Be Idiots! they can easily attach themselves to Ryan's skateboard. They come in a smaller size as well. As shown in Versus The Outbreak Ryan placed small gravity pucks in Mark's shoes and were able to help him jump much higher.
They can also be controlled from a distance. in the same episode, Harris used his Mech-link to control the device and steal Veracity's iPad from her bag.
| To view the Gravity Pucks gallery, click here.