The search term "Steel Coffee Cup 500ML 3040" refers to a 500 ml (milliliter) stainless steel coffee mug or travel tumbler, with 3040 being a specific product code or SKU used by a particular retailer, wholesaler, or manufacturer.

Here is the general product information, as the "3040" number itself is not a widely-known brand:

Capacity: 500ML (approximately 17 fluid ounces).

Material: Typically made from 304 food-grade stainless steel, which is a high-quality, durable, and rust-resistant material often labeled as 18/8 stainless steel.

Insulation: It is almost universally a double-wall, vacuum-insulated design, intended to keep hot beverages (like coffee or tea) hot and cold beverages cold for several hours.

Design/Features: These mugs often include:

A lid (spill-proof, slide-open, or screw-on).

A handle (though some 500ml tumblers are handle-less).