This is a new pair of Viton (fluorocarbon) o-rings for BSA Gold Star single rocker shafts. O-rings made of Viton have superior resistance to petroleum products and solvents, plus can withstand temperatures to 200C (392F). BSA part number 65-1855. Shipping to the US is $4. International shipping to most countries is $12. Extra pairs can be purchased at the same time for no additional postage.