Where to Buy

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Retailers' Descriptions

Here's what other sites are saying:

Soft aluminum heads are the easiest for pasting into vertical cracks. Copper heads are more difficult to paste due to the harder material. However, the reward is greater holding power in vertical cracks. Ref. Weight Length Diameter Material g oz mm in mm in 3030 (N.0) 4 0.1 10 0.4 4 0.2 Copper 303001 (N.1) 6 0.2 12 0.5 5 0.2 Copper 303002 (N.2) 7 0.2 12 0.5 6 0.2 Copper 303003 (N.3) 16 0.6 17 0.7 8 0.3 Copper 303004 (N.4) 21 0.7 17 0.7 10 0.4 Copper

- Bentgate.com

Available in either single or double, the Cassin Copper Heads are a necessity for any serious aid climber's rack. Ranging in size from 4mm to 10mm, Copper Heads are designed to be pasted into vertical seams and cracks that are too thin for nuts or cams. When crack size permits the use of a double, you can stand on the confidence of having the greatest vertical crack-holding power of any mash-able protection.

- Backcountry.com