These detailed periscopes are made from transparent plastic.Basically they are made for German panzer kits from Tamiya.The molds are better or no worser than Tamiya standard. So far Finemolds has released 3 set for most WWII German panzers.

MG-08 is for Late/Mid Tiger I ,Panther A/G and King Tiger:
2 periscopes for Dirver and Radio Operator hatches, 1 for Loader and 3 for the Commander Cupola on a sprue.

MG-09 is for Panzer III/IV:
3 periscopes and 3 cushions for the Commander Cupola on a sprue.

MG-23 is for Initial/Early Tiger I:
1 periscope for the Driver or Radio Operator hatch, 1 for Loader, 3 pericopes and 3 cushions for the Commander Cupola, and a Driver Visor block on a sprue.