C3 Gloss Metallic Blue Padded Bubble Envelopes (Qty 50) 324mm x 450mm1 2 day delivery as standard on this product Introducing our C3 324mm x 450mm Gloss Metallic Blue Padded Bubble Envelopes. Made from high quality materials, these envelopes are durable and designed to protect your items from bumps and knocks. With 100 envelopes in each pack, you'll have plenty to keep your business well stocked. Another added benefit is these are made from 40% recycled materials so can be recycled by you and your customers.