The Walthers 949-4157 Round Hay Bale in HO Scale is a set of basic scenery accessories for model railroads. Made by the manufacturer Walthers, this 20-pack of hay bales is designed to add realism to your train layout. With a scale of 1:87 and a gauge of HO, these hay bales are perfect for enhancing your model railroad scene with a touch of authenticity and detail.. Please see my other auctions for more kits, diecast and vintage collectibles.