Check the listing for details. Pine Ridge Nitro Button XL Black 2 Pack. Color: Black, Condition: New with tags. Listed at 13.30 USD. Pine Ridge Nitro Button XL Black 2/pk [PR58695] Combines dynamic design with a color flair, increases speed while quieting the string, easy installation and adjustment, weighs 19 grains each, 2 per pack. Mfg Number: 2724-BK WARNING: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.WARNING: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.WARNING: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.