This is a sprue of 5 different sets of 12 British Railways wagon buffers at the scale of 4mm:1ft (OO, P4). They are for spares for wagon kits without buffers, or where the modeller wants to use a different buffer style. Originally drawn up in a different scale for use on 24.5 ton hoppers (hence tops code HUO in the name) I have added a set of Oleo buffers with 16" scale diameter heads which were used on some other wagons but probably not on those hoppers.