1x, 2x, 3x, 4x leaders?

Fly fishing Tapered Leaders 12ft Available in 1X,2X, 3X ,4X,5X,6X

SF 30/75/100m Fly Fishing Tippet Line Clear Nylon Monofilament with Holder Leader Trout 0X 1X 2X 3X 4X 5X 6X 7X

Freshwater Leaders Scientific Anglers

Pre-tied Loop - Each leader has a hand-tied perfection loop in the butt end for fast and easy Rigging Multi-choice - To meet your requirements, we

Fly Fishing Tapered Leader with Pre-Tied Loop 9FT Nylon Fly Line Leader (10 Pack) 0X 1X 2X 3X 4X 5X 6X

Dropship Kylebooker Clear Nylon Tippet Line With Holder Fly Fishing Tippets Leaders Trout 0X 1X 2X 3X 4X 5X 6X 7X to Sell Online at a Lower Price

SF Fly Fishing Tippet Line Clear Nylon Monofilament with Holder Leaders Trout 0X 1X 2X 3X 4X 5X 6X 7X - AliExpress

Fly Leader 9FT 0X 1X 2X 3X 4X 5X 6X 7X Nylon Fly Tapered Leader With Loop

Does anybody have experience with these leaders? The Orvis SuperStrong 2 pack is what I have been using but is a bit expensive. : r/flyfishing

50yd Fluorocarbon Fly Fishing Tippet Ultra Clear 0X, 1X, 2X, 3X, 4X, 5X, 6X, 7X