Internal is a manufacturing process;many lures is only painted,brthe ability to attract fish is poor,this lure has a inner layer,it looks more beautiful and the ability to reflected light is better.inner is not easy to be damaged compared with outer.and it is more difficult to produce.so it is a senior lure.Item Specifics:Rattles,Slow Sinking,textured translucent body,3D holographic eyes make it very realisticWeight: 4.5g/pieceDiving Depth: 0.3-2.5 Meter. colour: picture colorsMaterial: ABS+metalsize: 6cmPackage Contents: 10*Fishing LuresOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.