1. Open track, easy to start, just dial by hand, intuitive visual sense, easy to understand the demo. 2. The back acrylic plate is the base plate, the supporting position is connected with the card buckle, the overall structure is sturdy and durable. 3. The coil is made of high temperature enameled wire, low power, low heat, no rust, long service life. 4. Adopting stainless steel wire to make the ring track, fast reaction speed and smooth operation. 5. Precision circuit board, each coil is a separate circuit board, do not affect each other, low and reliable., Weight: 2.20462262 pounds, Manufacturer: DIGNIFE