Primeline USA Speargun rubber is the most pure and best performing natural latex rubber available today. The rubber is made from the highest quality US natural latex rubber tubing available. It undergoes bio-compatibility, UV tolerance, and mechanical/time degradation testing on a regular basis to ensure maximum quality and performance. To prolong the life of your Speargun rubbers avoid extended exposure to UV light. Store in a cool, dry, dark place to obtain maximum rubber life.
 
Physical Properties:
+ Modulus at 100% - 125 PSI maximum + Tensile Strength - 3500 PSI minimum + Elongation at Break: - 750% minimum + Specific Gravity - 0.97 maximum + Shore A Durometer Hardness - 35 ± 5