Enhanced Upgrade - Made Of High Quality Silicone, It Has A Stronger Seal And Can Be Used Directly For Fermenting Dough. And Comes With A Small Collapsible Bowl, Practical And Convenient For Storage. Mixer Bowl Covers - Designed For Use With The 4.5-5 Quart Tilt-Head Bowl-Lift Stand Mixer, These Bowl Lids Effectively Keep Ingredients Inside The Bowl, Preventing Light Ingredients Like Flour From Flying Out And Keeping Kitchen Countertops Clean. Easy To Clean - The 4.5-5 Quart Mixers Bowl Covers Is Also Dishwasher Safe Or Hand Washable In Warm Water For Easy Cleaning. Only Fit For Stainless Steel Mixer Bowl - The Mixer Bowl Cover Has A Diameter Of 9.0 In/25.5cm And Is Compatible With Kitchenaid 4.5-5 Quart Tilt-Head Stand Mixers. It Is Only Compatible With Stainless Steel Mixing Bowls And Not Glass, Glass Flared-Edge, Flared-Edge, Or Ceramic Bowls Great Kitchen Gift -The Perfect Gift For Friends And Family Who Already Own A Kitchen Aid Tilt Stand Mixer. Whether It's Used To Store Ingredients Or To Promote Secondary Fermentation Of Dough, It's Ideal For The Avid Baker.