10pcs Silicone Wine Bottle Stopper Sealer Home Wine Making V.5 with hole

Features:
Semi-transparent
High elasticity
Made of food-grade silicone
Usable between -60 C and 250 C
Solid core
Superior than silicone foam
Fit 3L hydrochloric acid bottle and 3L fermentation bottle and 304 stainless steel fermentation barrel of 20L, 35L, 45L and 60L
The one with hole can add one-way valve while the other can't

Specifications:
Spec: with hole
Size: top diameter 29mm, bottom diameter 22mm, height 23mm
Color: semi-transparent
Weight:40g each 
Material: food-grade silicone