Description If you are looking for flask stoppers, consider our rubber stoppers. Simple in design and easy to use, they are suitable for both professional and personal applications. Compact and lightweight, these stoppers are easy to carry and store. They provide strong sealing performance and are made from reliable rubber material for safe and dependable use. Features - Color: Black - Material: Rubber - Dimensions: 4.10 x 4.10 x 2.50 cm / 1.61 x 1.61 x 0.98 in 3.70 x 3.70 x 2.50 cm / 1.45 x 1.45 x 0.98 in 3.20 x 3.20 x 2.50 cm / 1.26 x 1.26 x 0.98 in 2.70 x 2.70 x 2.50 cm / 1.06 x 1.06 x 0.98 in 2.60 x 2.60 x 2.50 cm / 1.02 x 1.02 x 0.98 in 2.50 x 2.40 x 2.40 cm / 0.98 x 0.94 x 0.94 in 2.50 x 2.00 x 2.00 cm / 0.98 x 0.79 x 0.79 in 2.50 x 1.90 x 1.90 cm / 0.98 x 0.75 x 0.75 in 2.50 x 1.70 x 1.70 cm / 0.98 x 0.67 x 0.67 in 2.50 x 1.50 x 1.50 cm / 0.98 x 0.59 x 0.59 in - Includes 11 different sizes - Ideal for use in laboratories, chemistry, medicine, and scientific research - Compatible with test tubes and flasks for effective sealing during experiments - Designed for easy insertion and removal - Smooth surface prevents damage to glassware - Compact design allows for convenient storage and organization Package List 5 x 000# Stoppers 2 x 00# Stoppers 2 x 0# Stoppers 2 x 1# Stoppers 2 x 2# Stoppers 2 x 3# Stoppers 2 x 4# Stoppers 1 x 5# Stoppers 1 x 6# Stoppers 1 x 7# Stoppers 1 x 8# Stoppers