High tech introduced from Dental word. No any harm effect. Environmental friendly. They cure in seconds under UV light, become crystal clear and glass smooth. Customer can use the dubbing needle open the bottleneck. No heat needed. Simple, ready to use, no need any preparation. Stay clear and never turns yellow and also super durable comparing to traditional epoxy, 100% Tack-free.<br> Thick UV glue (standard uv glue) is great for making surf candies, epoxy shrimp, and bait fish heads or any flies heads, also good in bodies or wing cases, or to coat a small thread head.<br> Thin UV glue flows easily with excellent penetration, applying on flies bodies, wings, or as coasting for decal eyes and heads. They are great in making nymphs, scud backs, chironomids, and more you can name. <br> Flew uv glue ready to use, no need any preparation. This super power flex UV glue will make vivid flies moving super realistic. They are also the best protection for all type knots. Customer can use the dubbing needle open the bottleneck.Cure in seconds under UV light, crystal clear and glass smooth. Stay clear and never turns yellow and also super durable comparing traditional epoxy. 100% Tack-free. Both of them are multi-purpose, instantly cure with UV light or sunlight.<br> SMART & COMPACT DESIGN: Only 5.6 Inches pen style design with Zoomable UV lens, IPX5 Water-Resistant. Riverruns 395nm UV pen make the UV glue curing fast than traditional 12 LED or 51 LED UV light. By rotating the top section of the light you can choose zoom in and zoom out for different sizes of UV glue. Perfect for fly tying flies heads, bodies and wings. 7 hours run time by 2*AAA batteries. (Batteries not include due to shipping safety concerns)<br>