Riccardo Cassin was an Italian mountaineer. Cassin began designing and producing mountaineering equipment in Lecco in 1947 when he produced his first rock pitons. In 1948 he produced his first hammers; his first ice axes appeared in 1949; and 1950 saw the introduction of his carabiners. Located near C.A.M.P., he worked closely with but separately from them. C.A.M.P. acquired the Cassin trademark in 1997.

These use a numbering scheme where #01 is size -1 (i.e. negative 1 or minus 1), #02 is size -2, and #03 is size -3.

↑ Set 447-457: Cassin Wired Stoppers; #03–#0–#7

• Made in Italy [2012].
• Curved & tapered front & rear faces, straight tapered sides.
• Aluminum alloy.

↑ 447: Cassin Wired Stopper; #03

• Made in Italy [2011].
• Size: 4x11 mm.
• Weight: 9 g.
• Curved & tapered front & rear faces, straight tapered sides.
• Aluminum alloy.
• Etched with the Cassing logo, "01–11," and "3" on the concave face.
  The tag on this one's crimp includes the note "NO MOUNTAINIEERING.".

↑ 448: Cassin Wired Stopper; #02

• Made in Italy [2011].
• Size: 6x12 mm.
• Weight: 14 g.
• Curved & tapered front & rear faces, straight tapered sides.
• Aluminum alloy.
• Etched with the Cassing logo, "01–11," and "2" on the concave face.

↑ 449: Cassin Wired Stopper; #01

• Made in Italy [2011].
• Size: 7x14 mm.
• Weight: 14 g.
• Curved & tapered front & rear faces, straight tapered sides.
• Aluminum alloy.
• Etched with the Cassing logo, "01–11," and "1" on the concave face.

↑ 450: Cassin Wired Stopper; #0

• Made in Italy [2011].
• Size: 9x14 mm.
• Weight: 26 g.
• Curved & tapered front & rear faces, straight tapered sides.
• Aluminum alloy.
• Etched with "01–11" on the concave face.

↑ 451: Cassin Wired Stopper; #1

• Made in Italy [2011].
• Size: 11x14 mm.
• Weight: 28 g.
• Curved & tapered front & rear faces, straight tapered sides.
• Aluminum alloy.
• Etched with "01–11" on the concave face.

↑ 452: Cassin Wired Stopper; #2

• Made in Italy [2011].
• Size: 13x18 mm.
• Weight: 32 g.
• Curved & tapered front & rear faces, straight tapered sides.
• Aluminum alloy.
• Etched with "01–11" on the concave face.

↑ 453: Cassin Wired Stopper; #3

• Made in Italy [2011].
• Size: 16x19 mm.
• Weight: 32 g.
• Curved & tapered front & rear faces, straight tapered sides.
• Aluminum alloy.
• Etched with "01–11" on the concave face.