US$ 25.00
ten per pack
Pairs 50mm of aperture with a 200mm focal length on a convex glass surface
and zinc supports density and specific-heat work
Designed for parallel gravity filtration
3/4" Plastic Marbles, 5-Pack Lab Supplies_Classroom ten per packFive pack of 3 4 inch plastic marbles, providing lightweight projectiles for collision and ramp experiments where steel or glass would carry too much momentum or break on impact.