Description If you are looking for flask stoppers, consider our rubber stoppers. Simple in design and easy to use, these stoppers are suitable for both professional and personal applications. Compact and lightweight, they provide strong sealing performance. Made from quality rubber, these stoppers are safe and reliable for laboratory 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 - Note: Includes 11 different sizes - Ideal for use in chemistry, medicine, and scientific research - Compatible with test tubes; provides reliable sealing for laboratory experiments - Designed for easy insertion and removal - Compact and space-saving, convenient for storage in labs or at home - Smooth surface prevents damage to glassware 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