The Ziland Needle Adaptors are for use with many ball pumps. Features 2mm needle. Size: 5mm and 7mm thread. Weight: 10g. Sold as a pack of 3 or a pack of 12. Additional information Glycerine or Needle Oil should be used when use when inflating balls (handballs, footballs, netballs, rugby balls etc) using a small amount to dampen the inside of the valve assists valve integrity.