Replacement Pith Balls for Electroscope, 10-Pack Item Type_Net Dark-complexion life-size human torso with

Dark-complexion life-size human torso with 13 removable organs including brain

Hand-cranked friction-wheel drive sandwiched between clear acrylic plates

and single-celled organism structure for protist biology teaching

and inner ear anatomy for upper-level anatomy teaching

one fitted with an exploder piston for momentum and action-reaction investigations

Replacement Pith Balls for Electroscope, 10-Pack Item Type_Net Dark-complexion life-size human torso withSpare pack of ten low mass pith balls sized for the standard pith ball electroscope, supplying replacements when the originals lose loft or split during repeated charging cycles.