The clownfish on the header card gives the colour scheme away at once: the marbles in this bag are red and bright yellow, the two colours twisted through the glass in bands. There are 21 of them, 20 of 16 mm and one large one of 25 mm.
Marbles start with a hollow or a chalk line. You shoot with your thumb, you try to hit the other player's marble, and after break time the swapping begins. The large 25 mm marble is the shooter you fire with - a head bigger than the rest and so the most wanted piece as well.
The marbles are glass, which makes them heavy enough to roll straight across paving and sand. The bag has an octagonal cardboard card printed with the quantities and the sizes.
Red and yellow marbles stand out in a bag full of blue and green, so this is a good addition for a collector - and a small present that can be used the moment it is unwrapped.