This is a quad fin with a rare art glass specification. It's very beautiful when viewed in sunlight and can also be used as interior decor. We have a limited quantity, so please purchase early if you're interested. New and unused. These are quad fins compatible with Future Fins. They resemble Machado quads. (This is my personal opinion.) These are performance quad fins designed with a flexible tip section that pursues responsiveness and a stiff base section that excels in drive. These fins combine the flow of traditional twin fish with the control of performance quads. ◎The material is made of fiberglass, which is also used by major manufacturers. Although it is a no-brand product, the distinctive VOLAN color is very cool and gives a luxurious feel. The sanding finish on the surface is also beautiful. ◎Please understand that the color may differ slightly from the actual product due to camera resolution. I am also selling other items. ◎Size Twin Fin Height approx. 124mm Base approx. 138mm Deep fin box height Rear Fin Height approx. 78mm Base approx. 105mm Shallow fin box height ◎There are two types of Future Fin box heights: deep with an 'f' mark and shallow with an 'x' mark. We cannot accept returns, exchanges, or complaints due to incorrect fin box height. Please check your board before purchasing. Thank you for your understanding. If it is difficult to attach or detach the fins, please adjust them by sanding. ☆The included soft case is slightly deteriorated. Please consider it a bonus. ◎Although new and unused, there may be slight scuffs or color variations from the manufacturing process or storage. This is a great deal for those who don't mind these minor imperfections.