Supplied with a removabe set of caps, the Combi-Feeder can be used as a block end or an open end feeder depending on the situation.This means that there is no need to carry around a large selection of heavy feeders in each variation.Available in a wide range of weight options, the Combi Feeder is the only feeder you need to carry. Medium: 30g, 45g, 60g, 75g, 90g. Large: 60g, 90g, 120g, 150g