When used with a focused light source, Steel Templates, or Gobos aid in projecting simple images onto your background. This is a Dynalite Set of 25 Stainless Steel Templates with a storage case. They are designed to stick to the Dynalite Magnetic Template Holder, which in turn is designed for use with the SR-0S Optical Head Attachment for the SH2000 and SH4080 flash heads.