20 Metal Black Skull Beads For 550 Paracord Bracelets, Lanyards, & Other Projects 20 Brand New Black Alloy Skull For Paracord Projects Measurements: 20mm x 11mm x 11mm with an approximate hole size of 6mm. Have any questions, please send me a message. Your order will almost always be shipped the following day, with the exception of Sundays.