骏鼎达：主要产品包括功能性保护套管和功能性单丝等，广泛应用于汽车、工程机械、轨道交通、通讯电子等领域

Group 1 - The company, Jun Ding Da (301538.SZ), specializes in the design, research and development, production, and sales of polymer modified protective materials [2] - Main products include functional protective sleeves and functional monofilaments, which are widely used in various fields such as automotive, engineering machinery, rail transit, and communications electronics [2]