Hetman Slide Gel (#7). Tuning Slide Grease.
SLIDE-GEL™ - This special tuning slide lubricant provides long-lasting seal and firm slide motion. A premium, hi-viscosity product that will not bunch-up in the ends of slide tubes. Adhesive formulation protects slides against corrosion and wear. Packaged in 22-ml bottles with special dropper tip applicator.
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You only need a very small amount and it leaves much less unwanted lubricant on the slide. It will keep the horn much cleaner for much longer than conventional slide grease.