... Metal lock mechanism, self-locking, high-density polypropylene plastic security seals. XGS-042 Security Plastic SealSpecificationsMaterials: PP / PE/NYLONMetal lock mechanism, self ... , courier services, etc.Printing Company logo or name, sequential numbersBar code available (additional charges needed)Colors: yellow, white, green, blue, red ... : Gross: 4.5 kg / Net: 4.0 kg XGS-042 Security Plastic Seal