If you are looking for flask stoppers, consider our rubber stoppers. Simple in design and easy to use, these stoppers are suitable for professional and personal applications. Compact and lightweight, they are easy to carry and store. Featuring strong sealing performance, these durable rubber 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 - Includes 11 different sizes - Ideal for use in chemical, medical, and scientific research applications - Compatible with test tubes, providing reliable sealing for laboratory experiments - Designed for easy insertion and removal - Smooth surface prevents damage to glassware - Compact design allows for convenient storage and use in laboratories or home settings 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# stopper 1 x 6# stopper 1 x 7# stopper 1 x 8# stopper