Rinzl Plastic Cover Slip measuring 22 mm x 22 mm is made of 0.007 in thick unbreakable clear vinyl and sold as 1000 per pack.
An excellent addition to your science classroom
Due to the sealed metal electrodes on the end of the tube, spectrum tubes light up when placed in the power supply
A great supplement to your matter lessons
Economically priced to fit your budget
Easy to handle, break-resistant shell makes it perfect for student use