Apollo PEX fasteners are designed for use with PEX-b pipe. Crimp rings are made from copper. Pinch clamps are constructed of high-quality stainless steel. Crimp sleeves are also constructed of high-quality stainless steel. Pro crimp rings and Pro pinch clamps are designed to remain in place on the pipe during installation. Unit: PK 75 UPC: 191988005085 Model Number: APXCR34LTJR