Karter Scientific is a United States based company dedicated to providing the best quality glass and plastic ware at affordable prices. Karter Scientific is a United States based company dedicated to providing the best quality glass and plastic ware at affordable prices. GLASS MEDIA BOTTLES WITH GL45 SCREW CAP, BOROSILICATE GLASS These heavy duty borosilicate glass round bottles can be used for storage as well as mixing and sampling. They include a linerless autoclavable blue polypropylene plug seal GL45 threaded cap with a drip-free pouring ring. Media Bottle are leak-proof. Max temperature of 140 degrees Celsius (284 degrees Fahrenheit). Available in 8 sizes - 50ml, 100ml, 250ml, 500ml, 1000ml, 2L, 5L, & 10L GL45 CAPS SAFE, DURABLE & LEAKPROOF: Offering superior heat and chemical resistance, the glass bottle storage caps are linerless, one-piece polypropylene plug seal caps with drip free pouring rings. USA PACKAGING Our products are packaged in the USA using USA sourced material If you received broken items, please let us know for full refund or replacement. Thank you! USA PACKAGING Our products are packaged in the USA using USA sourced material If you received broken items, please let us know for full refund or replacement. Thank you!