Filter rings set of 7

Set consisting of seven filter rings (Gukos) made of grey neoprene.Sizes:1: Ø outside 21 x 11 mm, Ø inside 17 x 7 mm, height 21 mm2: Ø outside 27 x 16 mm, Ø inside 22 x 11 mm, height 22 mm3: Ø outside 37 x 22 mm, Ø inside 31 x 16 mm, height 25 mm4: Ø outside 46 x 29 mm, Ø inside 39 x 22 mm, height 29 mm5: Ø outside 58 x 38 mm, Ø inside 50 x 30 mm, height 35 mm6: Ø outside 69 x 45 mm, Ø inside 60 x 36 mm, height 40 mm7: Ø outside 86 x 57 mm, Ø inside 75 x 46 mm, height 45 mm