RS Berkeley Trombone Slide Oil 5 Pack w/Marching Gloves Package includes Slide oil 5 pack with 1 pair of marching gloves. Slide oil: RS Berkeley Slide Oil is designed to offer long lasting, noiseless performance and unmatched slide action. Marching Gloves: These gloves are used by musicians primarily in marching bands and orchestras and can also be used by drum majors and majorettes. Universal size.