First, we must choose the seals with quality credibility and guarantee (products with no quality credit may lock not tightly and can not play the role of anti-theft);
Then, signing a contract before ordering. It is very important to require manufacturers to make sure not to provide the seals with same logo and the number to others ;
Third, Do not choose the type with same size and color as others (it’s easy to be copied.)
Fourth, any product has a certain manufacturing costs, some low-priced products in the purchase must be noted (some manufacturers cut costs by cutting corners to reduce costs).