Made from 100 % latex with a small (1 mm) inner diameter. That means more rubber working for the given diameter, resulting in more power, a quicker retraction rate, and slightly less recoil. Very snappy, yet still elastic and smooth to load. Capable of being stretched to 400% without collapsing. Longer lasting and better energy retention than other rubbers on the market. Provides an impressive amount of power for their given size, allowing for greater shaft speed and momentum. Ideally suited for single roller spearguns 80-110cm in length with a 7 mm spear shaft and double roller spearguns 100-140cm in length with an 8.5 mm spear shaft. Works extremely well when using twin and triple 15 mm bands on conventional spearguns. The 15mm is a perfect middle ground between the 14 and 16mm rubbers. Price is per foot