1x1mm Sterling Silver Crimp Tubes. Soft Flex® Crimp Tubes are crafted with the professional in mind. We have constructed a crimp tube that is almost twice as thick as others on the market. The sturdier build of the crimp is enhanced by the fact that they are also seamless. Finish your next piece securely with our designer crimps. 1x1mm Soft Flex® Crimp Tubes are recommended for .010 diameter beading wire.