3D Product Designer Needed for Silicone Consumer Product (CAD / STEP File)

We are seeking an expert Mechanical Engineer or 3D Product Designer to create a production-ready CAD model for a flexible silicone consumer accessory. The product is a single-piece, elastic band designed to wrap securely around a 2.86-inch diameter sphere. It features specific tactile geometric extrusions on the outer surface (parallel ridges and concentric rings) and micro-cavity geometry on the inner surface. Because of the simple geometry, we expect this initial asset creation to take roughly 5 to 10 hours for an experienced designer. SCOPE OF WORK: Optimize the inner diameter and wall thickness for high-tensile silicone (Shore Hardness 50A–60A) to ensure a tight, elastic compression fit on the sphere without slipping. Incorporate minor surface branding (debossed text) and leave a flat, smooth, untextured rectangular zone optimized for secondary silicone ink pad printing. Design micro-cavities on the underside optimized for clean release from an injection/compression mold tool. Deliver final, clean assets in production-ready formats (.STEP, .STP). IP PROTECTION & REQUIREMENTS (Please Read Carefully): NDA Required: The specific product concept, utility context, and visual references will only be shared with shortlisted candidates after a standard Mutual Non-Disclosure Agreement (NDA) is signed. Work-for-Hire: This project is strictly a "Work-for-Hire." Full intellectual property rights, copyrights, and all digital assets generated during this contract will belong 100% exclusively to the client upon final payment. Please include examples of molded silicone, rubber, or flexible elastomer consumer goods you have previously designed in your portfolio.