Blake Envelopes Nature First (C5) 162mm x 229mm 90gsm Self Seal Pocket Envelope (White) Pack of 500

The colour or combination of colours that a product is available in, expressed as common names such as "Black", "Silver" or comma‑separated lists like "Black, White". It indicates the visual appearance of the item for consumers.

The mass of a sheet or roll of media expressed in a standard unit such as grams per square meter (g/m²) or kilograms per square meter (kg/m²). It indicates how heavy the material is and can be used for handling, shipping calculations, or to compare different types of paper or film.

Indicates whether the product is manufactured using recycled materials or components. A value of "Yes" means that a significant portion of the product’s content has been recovered and reused, while "No" indicates it is produced entirely from virgin materials.

The method by which a product’s closure is sealed, such as peel‑and‑seal, self‑seal, gummed, press seal, or button seal. This attribute indicates how the product is closed and helps users choose items that meet their sealing or handling requirements.

A list of environmental, safety or quality certifications that a product has obtained from recognized authorities. Typical entries include RoHS, ENERGY STAR, CE, WEEE, TCO Certified, FCC, and other industry‑specific standards.

Indicates whether the product includes a window or transparent section that allows viewing of its contents. A value such as "Yes" or "Window" means a visible opening is present, while "No" or "Plain" indicates no window. This attribute helps customers determine if the item can be inspected without opening it.