Precision laser drilled pinhole apertures mounted on 20mm vinyl (pvc) discs. These pinholes are perfectly round and fault free. 
The pinholes are 50 microns thick (0.002″ / 0.05mm) –  extremely thin. Material is treated copper (will not oxidize if you intend to use them for solagraphy).
The vinyl discs are 100% opaque (they have a thin aluminium core).
These are the pinholes used on all the RealitySoSubtle cameras. The pinhole is sandwiched between the 20mm diameter disc (0.2mm thickness) and black aluminium tape. Pinhole size is laser engraved on the disc. These are great pinholes for your camera projects!
Free shipping worldwide in an A5 padded envelop.