This is a water clear oval made of ethically mined Tibet High Altitude natural enhydro quartz . This unique quartz oval of finest craftsmanship is clear with 1 big easily visible moving bubble and moving yellow sand. Bubble darts fast and afar. The specifications are 61*41*22 mm (2.4*1.61*0.86 inch) and 70 grams (0.15lb)  .