.insignia on a cap: Operational training cap use, produce by standard according to GJB2588.5-96, main raw materials are PVC resin, Mould plastics low to ask indicate sea, land, empty and insignia on a cap pattern, department of arms, print stamp membrane by hot to hold and press and shut at first, Glue on low to ask surface, main craft course mediate and mould plastics, not hot to shut, hole for main auxiliary materials. The external diameter of the insignia on a cap is ∮ 35mm, heat- resisting air aging performance out of shape 24 h for more than 70 °C.