Product Information Material: Buna, Buna APC Select a Product Part NumberColorSize 101-HX300Black3" 101-H300Gray, Grey3" 101-H200Gray, Grey2" 101-HX150Black1-1/2" 101-H100Gray, Grey1" 101-HX100Black1" 101-HX400Black4" 101-HX250Black2-1/2" 101-H400Gray, Grey4" 101-HX200Black2" 101-H150Gray, Grey1-1/2" 101-H250Gray, Grey2-1/2"