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The 10" by 20" black caterpillar sleeve is easier to see through than the white caterpillar sleeve. It is ideal for rearing caterpillars on deciduous shrubs and trees. It is also handy for obtaining eggs from wild collected Admirals and Viceroys on cherries and willows, respectively.
In order to avoid a greenhouse effect which may result in larval mortality, these sleeves do not have a clear vinyl window: