A "Custom 4 Inch Blue Plastic Shipping Corner Protectors Edge Protector" typically refers to a specialized protective device used in packaging to safeguard the corners and edges of items during shipping or transportation. Here's an overview of what this product might entail:

1. Purpose: These protectors are designed to prevent damage to goods by absorbing impacts and distributing pressure away from vulnerable corners and edges.

2. Material: They are made from durable plastic, often in a specific color such as blue, which can be customized according to the user's requirements.

3. Size: Specifically, the mention of "4 Inch" indicates the size of the edge protector, likely referring to the length of each side of the protector that fits over the corner or edge of an item.

4. Customization: The term "Custom" suggests that these protectors can be tailored to meet specific needs regarding size, color, and potentially even branding or labeling requirements.

5. Application: They are commonly used in various industries such as logistics, manufacturing, and retail to safeguard products ranging from furniture to electronic devices during shipment or storage.

If you're looking to source or purchase such custom corner protectors, it's advisable to contact packaging suppliers, manufacturers, or distributors who specialize in protective packaging materials. They can provide further details on customization options, pricing, and availability based on your specific needs.