Replacement Receiver Collar Straps For All Brands Electric Dog Fences | Black With White Bones | PetSafe, Invisible Fence, More Item: Replacement Electric Dog Fence Receiver Collar Strap (Adjustable) Material: Heavy Duty Nylon Size: Available in Up To 12", Up To 18" and Up To 26" Neck Sizes (Adjustable Strap) Width: 12" and 18" Are 3/4" Wide, 26" is 1" Wide Fits All Dog Fence Receivers With 1-1/4" Spacing and 1-5/8" Spacing (Center To Center)