Frienda 5 Pack Flask Weight Rings for Laboratory Use, PVC-Coated Stabilizer Rings to Prevent Floating and Tipping During Heating, for Erlenmeyer Flasks & Water Baths, 5 Sizes (30, 48, 56, 61, 74mm)

Features: Whether for daily teaching experiments or research projects, it can quickly match the corresponding flask, meeting the fixing needs of diverse scenarios and improving experimental preparation efficiency. Stable support ensures safe experimental operation and reduces experimental data deviation caused by container displacement, making it suitable for long-term continuous experiments. Specifications: Material: PVC Color: black, red, blue Size: Inner diameter about 30-74mm Package includes: 5 x PVC Donut Rings Notes: Manual measurement, please allow slight errors on size. The color may exist a slight difference due to different screen displays

• Secure & Stable During Heating: Designed to hold Erlenmeyer flasks firmly in place during heating or water bath applications; The weighted design prevents floating and tipping, helping create safer, more controlled lab setups
• Snug Fit with Protective PVC Coating:The soft PVC coating cushions direct contact with glassware while adding slight grip to prevent sliding. Helps protect flasks from scratches, chips, and accidental damage during heating
• Heavy-Duty Weighted Construction:Each ring is intentionally weighted to provide balanced downward force, improving stability in active heating environments. The solid construction ensures long-lasting durability in laboratory use
• 5 Sizes for Flexible Lab Setups:Includes inner diameters:30mm (160g), 48mm (317g), 56mm (536g), 61mm (679g), 74mm (989g).Covers a wide range of flask sizes for different experiments, making it a versatile accessory for water baths and heating setups
• Easy to Use & Clean:Simple to put on and remove. The smooth PVC surface allows easy cleaning after experiments, maintaining a professional and tidy lab environment