The S108 includes two fins, each with two tubes and two combined support loops.

• Inner tubes: 68.6 cm.
• Outer tubes: 1 m.
• Available only as a complete set.
• Does not contain removable parts or spare components.

Available in five resistance levels:

• Green: 8-24 lbs (3.6-10.8 kg)
• Red: 12-31 lbs (5.4-14.1 kg)

Resistance is measured when stretched 1 – 3 times the original length. When two tubes are connected, the resistance values double.