Pack of 20 hardened chrome steel ball bearings 6.35mm diameter = 1/4 inch.  Very common size for bikes, also useful crafts/ jewellery.  Penny not included in auction!  (Photo shows 10 but listing is for 20)

Grade G28, the same type of bearing used in bearing assemblies, top industrial grade according to German DIN 5401-1 standard and ISO 3290.  Also known as technical balls. 

FREE POSTAGE UK!   We always despatch items quickly, but if you need the item fast we strongly recommend you take the 1st class post option as 2nd class can be very slow these days (much slower than they claim).  Next day courier delivery option is available to England/Wales mainland only.