Acid Unresponsive Mirror Pro-Series YoYo Unresponsive Yo-yos do not return to you without using special BINDING techniques you can quickly learn from how to videos on YouTube. Learn how to become a yo-yo pro using our Mirror Series Professional Yo-yos. Polished high speed bearing ensures long spin times allowing you to accomplish many tricks. Our Yo-yos are made of aircraft grade aluminum alloy, not plastic. They are anodized in splatter effects. We deploy high speed aluminum and steel bearings in these units. These puppies spin for ages. This model has a ppe mirror insert on the sides. Specifications: Material: Aluminum Dimensions: 57mm x 40mm Weight: 2.5 oz Colorful Annodized Finish String IS included but NOT installed. Product Disclaimers: 1. This is an Un-Responsive Yoyo meaning, it does not return to you like a standard Yoyo. 2. Color patterns / splatter / Drip effects are unique to every Yoyo. The splatter effect and color coverage will vary. 3. The string is included but not installed. Installation instructions included. 4. Mirrors have a protective sheet that requires peeling off. 5. Yo-yos are shipping in bubble wrap only in poly shipping envelopes. No box or retail packaging.