This is a full air stone kit containing: 
Air stone of your choice 
Check valve 
Flow control valve (metal valves sold separately)
10 suction cups to hold the tubing 
Air tubing to the length selected 
All tubing is a standard 4mm fitting and anti kink. It you require a softer more flexible tubing let us know in the order notes 
Simply attach the tubing to an air pump to create tiny bubbles that not only gives an aquarium oxygen but helps circulate water. 
Suitable for all types of aquariums. 
do not hesitate to ask any questions and we will do our best to assist.