I started using Hyper-Active Silhouette Targets about 2 years ago,.. and I've never gone back to 'paper' targets since!
Let me tell you these are my GoTo Targets.
First,.. is the technique applied to these targets with a double layer of material.
The first material is a bright neon yellow which can be detected by the naked eye up to over 300+ yards which is painted onto an adhesive sticker making it super easy to stick anywhere.
So why are they BLACK?!!?
On top of the bright neon is a layer of black 'chalk' that covers the neon... which when punctured by a bullet breaks away the chalk and reveals the neon making a change in light - easy for your eyes to pick up.