1. Sound crisp and decompression, BD model 5 pairs of magnets, C model 10 pairs of magnets, feel different
2. A variety of gameplay, resistant, mechanical, and restless hands
3. Flat push, pattern rotation, fan expansion, squeak plate
4. Material: stainless steel
5. Limit position: ceramic beads
6. Weight: B model: 65g, C model: 56g, D model: 69g