Mary McCartney/MPL Communications; Rob ShanahanPaul McCartney, Ringo Starr and Eric Clapton are among the major pop and rock stars who have contributed signed and/or worn neck ties and other fashion accessories to an online auction to benefit Cahonas Scotland, a U.K. charity that raises awareness about cancers that specifically affect men.

The Loosen Up! auction, which promotes Testicular Cancer Awareness Month, runs through this Sunday, April 24, and the items are up for bid now at Among the many other music artists contributing items to the sale are Rod Stewart, Queen guitarist Brian May, Barry Manilow, Tom Jones, Annie Lennox, The Pet Shop BoysNeil Tennent and Elvis Costello.

McCartney has donated a yellow scarf he wore in conjunction with promoting the 1984 animated film Rupert and the Frog Song.

According to Cahonas Scotland, the ties, scarves and other items donated to the sale are meant to encourage men to “loosen up” and not be “tongue tied” about discussing male cancers such as testicular, prostate and breast cancer.

Other celebrities contributing items to the auction include Shirley Bassey, Garth Brooks, One Direction, Bruno Mars, Michael Buble, Bryan Cranston, Mark Hamill, Ryan Gosling, Ricky Gervais, Sarah Jessica Parker, Roger Federer and Rafael Nadal.

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