Okay, if your Oster blender is leaking from the bottom, this 4-pack of gasket seals is probably all you need to fix it! These silicone O-rings are the exact replacement for most Oster and Osterizer blender models (just not the Pro 1200 or In2uitive models). The natural silicone material is flexible, durable, and creates a perfect watertight seal to stop those annoying leaks under your blender jar. Each gasket measures about 2.55 inches in outside diameter and 1.95 inches inside - just check your old one to make sure it matches. Installation is super simple: unscrew the jar base, remove the old cracked gasket, pop this new one in place, and reassemble. No tools needed, and it takes literally two minutes. Having four in the pack is perfect because you can fix multiple blenders or keep spares for when the next one wears out. These are way cheaper than buying a new blender, and they work just as well as the original factory parts. The silicone holds up to blending heat and won't degrade like rubber can over time. If your smoothies are leaking or your blender isn't sealing properly anymore, don't toss the whole appliance - just spend a few bucks on these replacement gaskets and your blender will be like new again. Seriously, it's one of the easiest and most satisfying fixes you'll ever do!