Bikeyoke Barkeeper 31.8mm Reducer Sleeves YGroup_7033711493165 The arms are made of

The arms are made of heavy-duty steel

Palm Style: Single-layer polyurethane palm for weather protection

it comes in its own neoprene bag so it won't damage anything else it's packed with

Does it fold up for storage: Yes folds down

weight-optimized for Enduro

Bikeyoke Barkeeper 31.8mm Reducer Sleeves YGroup_7033711493165 The arms are made ofThese reducers allow the use of handlebars with a 31. 8mm clamping diameter in our Barkeeper stem, which is normally designed for 35mm handlebars. Weight: 19g pairNote: These sleeves were specifically designed for the BikeYoke Barkeeper stem. Other stems were not checked for compatibility. Stem not included.