Craftsman Electric Trimmer Starter - Model 85951 GREAT QUALITY. SuperBearPower swing strap are the same quality and strength as seat belts. Holds up to 1000 lbs. It has a double box stitch which makes it much stronger. These extra-long straps for hammocks are adjustable, which means you can wrap them around most any size tree - from small to large - and avoid damage. Safe and Fun for the whole family.