The Ultra Seal Series 700 line of radial and axial seals are energized by a unique cantilever spring design. This combination of seal profiles and spring design was developed for use in a wide range of applications requiring a balance between maximum sealing ability and low friction operation. Call at 951-801-2589 for more information about spring energized Teflon seal or visit our website.My Official Website:- http://ultra-seals.com/Address:- 11801 Pierce Street, Suite 200, Riverside, CA 92505Phone:- 951-801-2589