Perlite is known as volcanic glass and a lightweight soil conditioner. It helps to loosen clay soil, reduce caking, improve drainage and aeration.
Perlite also can be added to the cactus and succulent soil if you prefer lightweight potting medium rather than sand.
Medium : approx 300ml, package size 14cm x 9cm
Large : approx. 1000ml, package size 20.5cm x 13cm