Highest elasticity and fatigue resistance. The elastic packs are marked according to size and strength with symbols. Every type can therefore be quickly identified. Strength: Strength ratings are based on the elastic being stretched 3 times the listed inner diameter. Content: 30 x 100 pieces = 3000 pieces Traction force: medium 1.3 N (128 g) Material: latex Color: natural Inner ø: 9.5 mm / 3/8 inch