The new PROGRESSIVE BLACK rubber bands by CETMA COMPOSITES are made in Italy with pure materials of the highest quality and have been designed to complete the range of rubber bands for spearguns.
Unlike the MAGNUM, the new PROGRESSIVE BLACK have a high progressive behavior, and are ideal for setting up arbalete spearguns traditional propulsion, single and double circular bands.
In this way, a single layer of rubber with additives is used, to ensure gradual recovery of deformation, a typical feature of progressive elastic bands.
The PROGRESSIVE BLACK are very performing at different elongation factors: the table shows the forces developed for different stretching factors; these data are useful for setting up your speargun.