These are called Tissue Culture Pouches. They are small zip locked bags of aquarium plants grown in a laboratory conditions and guaranteed to be free of all pesticides and bugs like snails.
Also known as Red watermilfoil, this aquarium plant has vivid and intense RED colours which makes it a real eye catcher. With fine leaves and a bushy appearance, when it sways in the current, it becomes incredibly mesmerising. To flourish it does require high light and CO2 but when it gets everything it needs, it can grow 40cm in height or more. Plant in groups of 3 or more for best effects.